Serbian police officers of the Special Anti-Terrorist Unit pose for a picture in their base outside Belgrade October 8, 2014. When the killing of an unarmed black teenager by a white policeman in Ferguson, Missouri, in August sparked sometimes violent protests, the response of police in camouflage gear and armoured vehicles wielding stun grenades and assault rifles seemed more like a combat operation than a public order measure. Some U.S. police departments have recently acquired U.S. military-surplus hardware from wars abroad, but there are many law enforcers around the world whose rules of engagement also allow the use of lethal force with relatively few restrictions. But for every regulation that gives police wide scope to use firearms, there is another code that sharply limits their use. In Serbia, police may use measures ranging from batons to special vehicles, water cannon and tear gas on groups of people who have gathered illegally and are behaving in a way that is violent or could cause violence, but they may use firearms only when life is endangered. (Photo by Marko Djurica/Reuters)

Children eat watermelons to meet the “beginning of autumn” at a kindergarten in Handan, China on August 7, 2015. Chinese tradition to eat watermelons or peaches before that day symbolises “biting away summer”. The solar term ‘beginning of autumn’ falls on 8 August this year. (Photo by Xinhua/REX Shutterstock)

A woman uses her mobile phone as she walks past a billboard with a portrait of a Russian soldier and the words “Glory to the heroes of Russia” in St. Petersburg, Russia, Saturday, August 20, 2022. (Photo by Dmitri Lovetsky/AP Photo)

Greece competes in the final of the women's team free artistic swimming event during the World Aquatics Championships in Fukuoka on July 21, 2023. (Photo by François-Xavier Marit/AFP Photo)

A man shows his tattoos at the 7th Hong Kong China International Tattoo Convention in Hong Kong on August 25, 2023. (Photo by Isaac Lawrence/AFP Photo)

Yoga enthusiasts perform a yoga exercise in a wine yoga class inside “Van Gogh: The Immersive Experience”, a multi-sensorial exhibition featuring artworks of renowned artist Vincent van Gogh at a department store in Bangkok, Thailand, August 5, 2023. (Photo by Athit Perawongmetha/Reuters)

Dawlish Carnival 50th anniversary pram race featuring the famous Dawlish Black Swan in England on August 15, 2023. (Photo by nidpor/StockimoNews/Alamy Live News)

Valeria Gonzalez Maidana of Paraguay performs in the final round of the first Budapest Ballet Grand Prix in the National Dance Theatre in Budapest, Hungary on November 23, 2023. The international ballet competition was launched by the Hungarian Dance University, a leading training facility of Hungarian professional dancers, to promote ballet and dance art in Hungary. The competition offers young dancers an opportunity to compete and gain exposure in the international dance scene, and provides scholarships and career opportunities for the most outstanding dancers. The event runs from 21 to 24 November. (Photo by Tamas Vasvari/EPA)