Riot police stand guard as rioters set fires and throw bricks in Mong Kok district of Hong Kong, Tuesday, February 9, 2016. Hong Kong's Lunar New Year celebration descended into chaotic scenes as protesters and police clashed over a street market selling fish balls and other local holiday delicacies. (Photo by Vincent Yu/AP Photo)





Smoke rises as rioters set fires on a street in Mongkok district of Hong Kong, Tuesday, February 9, 2016. (Photo by Vincent Yu/AP Photo)





An injured rioter police is attended by a colleague as rioters set fires and throw bricks at them in Mong Kok district of Hong Kong, Tuesday, February 9, 2016. (Photo by Vincent Yu/AP Photo)





Riot police try to block the bricks thrown by the protesters on a street in Mongkok district of Hong Kong, Tuesday, February 9, 2016. (Photo by Kin Cheung/AP Photo)





A rioter tries to throw a litter bin at police on a street in Mong Kok district of Hong Kong, Tuesday, February 9, 2016. (Photo by Kin Cheung/AP Photo)





Rioter police arrest a rioter in Mong Kok district of Hong Kong, Tuesday, February 9, 2016. (Photo by Vincent Yu/AP Photo)





Protesters collect bricks from a pathway during clashes with police in Mong Kok district of Hong Kong, Tuesday, February 9, 2016. (Photo by Kin Cheung/AP Photo)





Riot police officers react as rioters set fires and throw bricks at them in Mong Kok district of Hong Kong, Tuesday, February 9, 2016. (Photo by Vincent Yu/AP Photo)





A rioter tries to throw bricks at police in Mong Kok district of Hong Kong, Tuesday, February 9, 2016. (Photo by Vincent Yu/AP Photo)





A police officer walks past fire set by rioters in Mong Kok district of Hong Kong, Tuesday, February 9, 2016. (Photo by Vincent Yu/AP Photo)





Rioters try to throw bricks and other objects at police in Mong Kok district of Hong Kong, Tuesday, February 9, 2016. (Photo by Vincent Yu/AP Photo)





A protester kicks a riot police in Mong Kok district of Hong Kong, Tuesday, February 9, 2016. Hong Kong's Lunar New Year celebration descended into chaotic scenes as protesters and police, who fired warning shots into the air, clashed over a street market selling fish balls and other local holiday delicacies, leaving dozens injured and arrested. (Photo by Kin Cheung/AP Photo)





Rioters throw bricks at police in Mong Kok district of Hong Kong, Tuesday, February 9, 2016. (Photo by Vincent Yu/AP Photo)





A rioter throws bricks at police and lit fires on streets in Mongkok district of Hong Kong, Tuesday, February 9, 2016. Rioters clashed with police overnight and into the early hours of Tuesday in a crowded area of Kowloon. The unrest started when local authorities tried to prevent street food sellers from operating on Monday night. Activists who are dissatisfied with Hong Kong's administration took part in the clashes, local media reports said. (Photo by Kin Cheung/AP Photo)





Rioters set fires on streets in Mongkok district of Hong Kong, Tuesday, February 9, 2016. (Photo by Kin Cheung/AP Photo)





Rioters throw bricks at police and lit fires on streets in Mongkok district of Hong Kong, Tuesday, February 9, 2016. (Photo by Kin Cheung/AP Photo)





Rioters scuffle with police on a street in Mongkok district of Hong Kong, Tuesday, February 9, 2016. (Photo by Kin Cheung/AP Photo)





A rioter is taken away by police on a street in Mongkok district of Hong Kong, Tuesday, February 9, 2016. (Photo by Kin Cheung/AP Photo)





Riot police move forward to the protesters on a street in Mongkok district of Hong Kong, Tuesday, February 9, 2016. (Photo by Kin Cheung/AP Photo)





A protester (bottom) is arrested by riot police during a clash at Hong Kong's Mongkok shopping district, China early February 9, 2016. Police say three people have been arrested after a clash over illegal hawkers, leading to a standoff involving riot police, government radio reported. (Photo by Liau Chung-ren/Reuters)





A protester is arrested by riot police after a clash at Hong Kong's Mongkok shopping district, China early February 9, 2016. (Photo by Liau Chung-ren/Reuters)





Protesters supporting illegal hawkers carry makeshift shields at Hong Kong's Mongkok shopping district, China early February 9, 2016. (Photo by Liau Chung-ren/Reuters)





An injured policeman receives treatment after clashes with protesters at Hong Kong's Mongkok shopping district, China early February 9, 2016. (Photo by Liau Chung-ren/Reuters)





Riot police react as they charge protesters supporting illegal hawkers at Hong Kong's Mongkok shopping district, China early February 9, 2016. (Photo by Liau Chung-ren/Reuters)