In pictures: Violence at G20 protestsPublished7 July 2017Shareclose panelShare pageCopy linkAbout sharingImage source, Getty ImagesImage caption, There were fierce clashes between anti-G20 protesters and the police, and the situation was considered too volatile to allow US First Lady Melania Trump to attend a tour with the other G20 spouses.Image source, Getty ImagesImage caption, Far-left extremists threw rocks, set light to barricades and looted shops. Hamburg's police described the situation as "very serious".Image source, AFPImage caption, It is thought there are about 100,000 anti-G20 protesters in Hamburg - but only a small proportion are taking part in the violence.Image source, AFPImage caption, About 20,000 officers are on duty over the course of the G20.Image source, ReutersImage caption, Protesters have set cars alight, smashed windows and fired flares at police helicopters.Image source, AFPImage caption, They are protesting about a range of issues, including climate change, global wealth inequalities and the presence of Donald Trump and Vladimir Putin at the summit.Image source, AFPImage caption, Police have been using water cannons to disperse protesters and put out the fires.Image source, ReutersImage caption, German Chancellor Angela Merkel condemned the violence, saying it was "unacceptable" to "put peoples' lives in danger, put the protesters' own lives in danger".Image source, ReutersImage caption, Friday night's protests were the latest in a series of demonstrations which began before the world leaders had even arrived.More on this storyIn pictures: Hamburg hosts G20 summitPublished7 July 2017Who are the G20 protesters?Published7 July 2017