A protester raises his umbrellas in front of tear gas which was fired by riot police to disperse protesters blocking the main street to the financial Central district outside the government headquarters in Hong Kong, September 28, 2014. (Photo by Tyrone Siu/Reuters)

Riot police stand guard at Central in Hong Kong September 28, 2014. (Photo by Tyrone Siu/Reuters)

Riot police fire teargas to disperse protesters after thousands of demonstrators blocked the main street to the financial Central district outside the government headquarters in Hong Kong September 29, 2014. (Photo by Reuters/Stringer)

Riot police fire teargas to disperse protesters, after thousands of protesters blocked the main street to the financial Central district outside the government headquarters in Hong Kong September 28, 2014. (Photo by Reuters/Stringer)

Riot police use pepper spray as they clash with protesters, as tens of thousands of protesters block the main street to the financial Central district outside the government headquarters in Hong Kong September 28, 2014. (Photo by Bobby Yip/Reuters)

Protesters disperse as riot police fire teargas after thousands of protesters blocked the main street to the financial Central district outside the government headquarters in Hong Kong September 28, 2014. (Photo by Bobby Yip/Reuters)

Riot police patrol as tens of thousands of protesters block the main street to the financial Central district (at background) outside the government headquarters in Hong Kong September 28, 2014. (Photo by Bobby Yip/Reuters)

A protester throws an umbrella at riot police as fellow demonstrators blocked the main street to the financial Central district outside the government headquarters in Hong Kong September 29, 2014. (Photo by Tyrone Siu/Reuters)

Riot policemen with tear gas launchers stand guard as protesters block the main street to the financial Central district outside the government headquarters in Hong Kong, September 28, 2014. (Photo by Tyrone Siu/Reuters)

A riot policeman uses pepper spray during clash with protesters, as tens of thousands of protesters block the main street to the financial Central district outside the government headquarters in Hong Kong, September 28, 2014. (Photo by Tyrone Siu/Reuters)

Protesters wearing raincoats and carrying umbrellas face pepper spray from riot police, as tens of thousands of protesters block the main street to the financial Central district outside the government headquarters in Hong Kong September 28, 2014. (Photo by Bobby Yip/Reuters)

Tens of thousands of protesters block traffic on the main road leading to the financial Central district outside the government headquarters in Hong Kong September 28, 2014. (Photo by Bobby Yip/Reuters)

Riot police target pro-democracy students with pepper spray after hundreds of protesters stormed into a restricted area in Hong Kong September 27, 2014. (Photo by Tyrone Siu/Reuters)

A protester is taken away by policewomen after storming into the government headquarters in Hong Kong September 27, 2014. (Photo by Bobby Yip/Reuters)

A pro-democracy student stands on railings during a rally outside the government headquarters in Hong Kong, as riot police stand guard, early September 28, 2014. (Photo by Tyrone Siu/Reuters)

A man paints the scene of protesters and riot police during a rally attended by thousands in front of the government headquarters in Hong Kong September 27, 2014. (Photo by Bobby Yip/Reuters)

Protesters hold up signs during an evening rally attended by thousands in front of the government headquarters in Hong Kong September 27, 2014. (Photo by Bobby Yip/Reuters)

A protester reacts as she is dragged away by police after storming in government headquarters in Hong Kong September 27, 2014. (Photo by Bobby Yip/Reuters)

A policeman reacts during a confrontation with protesters at the government headquarters, after a rally ahead of the October 1 “Occupy Central” civil disobedience movement in Hong Kong September 26, 2014. (Photo by Bobby Yip/Reuters)

A protester receives help after being pepper sprayed during a confrontation with the police, following a rally for the October 1 “Occupy Central” civil disobedience movement in Hong Kong September 27, 2014. (Photo by Bobby Yip/Reuters)

A protester receives help after being pepper sprayed during a confrontation with the police, following a rally for the October 1 “Occupy Central” civil disobedience movement in Hong Kong September 27, 2014. (Photo by Bobby Yip/Reuters)

A protester wearing rudimentary protection against pepper spray is pictured during a confrontation with the police, after a rally for the October 1 “Occupy Central” civil disobedience movement in Hong Kong September 27, 2014. (Photo by Bobby Yip/Reuters)

Riot police fire pepper spray into the crowds as thousands of protesters surround the government headquarters in Hong Kong Sunday, September 28, 2014. Hong Kong police used tear gas on Sunday and warned of further measures as they tried to clear thousands of pro-democracy protesters gathered outside government headquarters in a challenge to Beijing over its decision to restrict democratic reforms for the city. (Photo by Wally Santana/AP Photo)

Police clash with demonstrators during a protest near the central government offices in Hong Kong, China, on Sunday, September 28, 2014. Pro-democracy protesters kick-started their campaign to occupy central Hong Kong after police clashed with students, demanding that China withdraws proposals to control the city's elections. (Photo by Lam Yik Fei/Bloomberg)

A pro-democracy protester has pepper spray washed from her eyes by sympathetic supporters as they block the main highway through Admiralty, next to the Hong Kong government's headquarters in Hong Kong's downtown district, on the first day of the mass civil disobedience campaign Occupy Central, Hong Kong, China, 28 September 2014. Thousands of pro-democracy demonstrators surrounded central government offices and blocked major streets in Hong Kong on Sunday to protest China's decision to restrict open elections in the territory. The protests followed a decision last month by China's top legislative body to restrict the nominations for chief executive in 2017. The candidate who wins the popular vote would have to be formally appointed by the central government before taking office. (Photo by Alex Hofford/EPA)

Pro-democracy protesters hold a banner saying “No Communict Party” during the first day of the mass civil disobedience campaign Occupy Central, Hong Kong, China, 28 September 2014. (Photo by Alex Hofford/EPA)

A demonstrator gestures opposite policemen during a pro-democracy protest in Hong Kong on September 28, 2014. Police fired tear gas as tens of thousands of pro-democracy demonstrators brought parts of central Hong Kong to a standstill in a dramatic escalation of protests that have gripped the semi-autonomous Chinese city for days. (Photo by Xaume Olleros/AFP Photo)

Protesters run for cover as riot police fire teargas after thousands of protesters blocked the main street to the financial Central in Hong Kong September 29, 2014. Some Hong Kong financial firms advised staff to work from home on Monday or go to secondary offices after thousands of pro-democracy demonstrators blocked parts of the city and clashed with police. (Photo by Tyrone Siu/Reuters)

Protesters push a traffic barrier to block the main street to the financial Central in Hong Kong September 28, 2014. Some Hong Kong financial firms advised staff to work from home on Monday or go to secondary offices after thousands of pro-democracy demonstrators blocked parts of the city and clashed with police. (Photo by Tyrone Siu/Reuters)

Police fire tear gas at demonstrators during a protest near central government offices in Hong Kong, China, on Sunday, September 28, 2014. (Photo by Lam Yik Fei/Bloomberg)

Anti-government activists gather near government offices during a protest in Hong Kong, China, in the early morning hours of Sunday, September 28, 2014. (Photo by Lam Yik Fei/Bloomberg)

A secondary school student wears a yellow ribbon pinned to her T-shirt during a rally against Beijing's election framework for Hong Kong, outside the government headquarters in Hong Kong September 26, 2014. Hundreds of school children joined university students demanding greater democracy on Friday, capping a week-long campaign that has seen a large cut-out depicting Hong Kong's leader as the devil paraded through the city and calls for him to resign. (Photo by Tyrone Siu/Reuters)

A protester raises placards that read “Occupy Central”, right, and “Civil disobedience” in front of riot policemen outside the government headquarters in Hong Kong, Saturday, September 27, 2014. Riot police on Saturday arrested scores of students who stormed the government headquarters compound in Hong Kong's Central district during a night of scuffles to protest China's refusal to allow genuine democratic reforms in the semiautonomous region. (Photo by Vincent Yu/AP Photo)

Riot policemen scuffle with protesters after young pro-democracy activists forced their way into Hong Kong government headquarters during a demonstration in Hong Kong, early Saturday, September 27, 2014. (Photo by AP Photo/Apple Daily)

Riot policemen use pepper spray to young pro-democracy activists who forced their way into Hong Kong government headquarters during a demonstration in Hong Kong, early Saturday, September 27, 2014. The scenes of disorder came at the end of a weeklong strike by students demanding China's communist leaders allow residents to directly elect a leader of their own choosing in 2017. (Photo by AP Photo/Apple Daily)

A police officer reacts outside of Hong Kong government complex on September 27, 2014 in Hong Kong. Thousands of students from more than 20 tertiary institutions started a week-long boycott of classes in protest against Beijing's conservative framework for political reform in Hong Kong. (Photo by Anthony Kwan/Getty Images)

Pro-democracy protesters demonstrate in Hong Kong on September 28, 2014. Police fired tear gas as tens of thousands of pro-democracy demonstrators brought parts of central Hong Kong to a standstill on September 28, in a dramatic escalation of protests that have gripped the semi-autonomous Chinese city for days. It marked a dramatic escalation of protests in the city, which rarely sees such violence, after a tense week of largely contained student-led demonstrations exploded into mass angry street protests. (Photo by Xaume Olleros/AFP Photo)

A student protester tries to negotiate with riot police as they fire pepper spray in to the crowd as thousands of protesters surround the government headquarters in Hong Kong Sunday, September 28, 2014. Hong Kong police used tear gas on Sunday and warned of further measures as they tried to clear thousands of pro-democracy protesters gathered outside government headquarters in a challenge to Beijing over its decision to restrict democratic reforms for the city. (Photo by Wally Santana/AP Photo)

Protesters block the main road to the financial Central district (background) in Hong Kong September 29, 2014. Riot police advanced on Hong Kong democracy protesters in the early hours of Monday, firing volleys of tear gas after launching a baton-charge in the worst unrest there since China took back control of the former British colony two decades ago. China said on Sunday it opposes all kinds of illegal behaviour in Hong Kong that undermines social stability as pro-democracy supporters geared up for a showdown with police as they push demands for greater political freedoms in the former British colony. (Photo by Bobby Yip/Reuters)

Hundreds of protesters block a main road at Hong Kong's shopping Mongkok district September 29, 2014. Riot police advanced on Hong Kong democracy protesters in the early hours of Monday, firing volleys of tear gas after launching a baton-charge in the worst unrest there since China took back control of the former British colony two decades ago. (Photo by Liau Chung-ren/Reuters)

Hundreds of protesters block traffic on Nathan Road at Hong Kong's shopping Mongkok district September 29, 2014. (Photo by Liau Chung-ren/Reuters)

A protester puts on a gas mask to prepare for a possible tear gas attack as hundreds of protesters block a main road at Hong Kong's shopping Mongkok district September 29, 2014. (Photo by Liau Chung-ren/Reuters)

A protester is helped by another to put on a gas mask to prepare for a possible tear gas attack as hundreds of protesters block a main road at Hong Kong's shopping Mongkok district September 29, 2014. (Photo by Liau Chung-ren/Reuters)

A protester stands as he blocks the main street to the financial Central district, outside the government headquarters in Hong Kong, September 29, 2014. (Photo by Carlos Barria/Reuters)