Prosecutors in Milan have opened an investigation into Italians who allegedly paid members of the Bosnian Serb army for trips to Sarajevo so that they could kill citizens during the four-year siege of the city in the 1990s.

More than 10,000 people were killed in Sarajevo by constant shelling and sniper fire between 1992 and 1996 in what was the longest siege in modern history, after Bosnia and Herzegovina declared independence from Yugoslavia.

The snipers were perhaps the most feared element of life under siege in Sarajevo because they would pick off people on the streets, including children, at random, as if it was a video game or a safari.

Groups of Italians and other nationalities, so-called “sniper tourists”, are alleged to have participated in the massacre after paying large sums of money to soldiers belonging to the army of Radovan Karadžić, the former Bosnian Serb leader who in 2016 was found guilty of genocide and other crimes against humanity, to be transported to the hills surrounding Sarajevo so that they could shoot at the population for pleasure.