Crowds of people have attended a funeral ceremony in the Istanbul courthouse where a prosecutor was taken hostage on Tuesday and who later died after police tried to rescue him. br br The two gunmen holding Mehmet Selim Kiraz were also killed in a shootout. br br The captors were members of the extreme-left Revolutionary People’s Liberation Party Front (DHKP-C). br br On its website, the group said the hostage-taking was an act of revenge for the death of a teenager, whose case was being investigated by the prosecutor. br br Fifteen-year-old Berkin Elvan was injured by a police tear gas canister during anti-government protests in 2013 and died nine months later. br br DHKP-C sympathisers clashed with police in two Istanbul neighbourhoods in the wake of the hostage siege, local media reported.br br Meanwhile, a leftist union website said riot police detained 36 students at Istanbul University after posters referring to one of the dead hostage takers was hung in the law faculty.