The public prosecutor's office in Milan has opened an investigation into claims that Italian citizens travelled to Bosnia-Herzegovina on "sniper safaris" during the war in the early 1990s.

Italians and others are alleged to have paid large sums to shoot at civilians in the besieged city of Sarajevo.

The Milan complaint was filed by journalist and novelist Ezio Gavazzeni, who describes a "manhunt" by "very wealthy people" with a passion for weapons who "paid to be able to kill defenceless civilians" from Serb positions in the hills around Sarajevo.

Different rates were charged to kill men, women or children, according to some reports.

More than 11,000 people died during the brutal four-year siege of Sarejevo.

Yugoslavia was torn apart by war and the city was surrounded by Serb forces and subjected to constant shelling and sniper fire.

Similar allegations about "human hunters" from abroad have been made several times over the years, but the evidence gathered by Gavazzeni, which includes the testimony of a Bosnian military intelligence officer, is now being examined by Italian counter terrorism prosecutor Alessandro Gobbis.

The charge is murder.

The Bosnian officer apparently revealed that his Bosnian colleagues found out about the so-called safaris in late 1993 and then passed on the information to Italy's Sismi military intelligence in early 1994.

The response from Sismi came a couple of months later, he said. They found out that "safari" tourists would fly from the northern Italian border city of Trieste and then travel to the hills above Sarajevo.

"We've put a stop to it and there won't be any more safaris," the officer was told, according to Ansa news agency. Within two to three months the trips had stopped.

Ezio Gavazzeni, who usually writes about terrorism and the mafia, first read about the sniper tours to Sarajevo three decades ago when Italian newspaper Corriere della Sera reported the story, but without firm evidence.

He returned to the topic after seeing "Sarajevo Safari", a documentary film from 2022 by Slovenian director Miran Zupanic which alleges that those involved in the killings came from several countries, including the US and Russia as well as Italy.

Gavazzeni began to dig further and in February handed prosecutors his findings, said to amount to a 17-page file including a report by former Sarajevo mayor Benjamina Karic.

An investigation in Bosnia itself appears to have stalled.

Speaking to Italy's La Repubblica newspaper, Gavazzeni alleges that "many" took part in the practice, "at least a hundred" in all, with Italians paying "a lot of money" to do so, up to €100,000 (£88,000) in today's terms.

In 1992, late Russian nationalist writer and politician Eduard Limonov was filmed firing multiple rounds into Sarajevo from a heavy machine gun.

He was being given a tour of hillside positions by Bosnian Serb leader Radovan Karadzic, who was later convicted of genocide by an international tribunal in the Hague.

Limonov didn't pay for his war tourism, though. He was there as an admirer of Karadzic, telling him: "We Russians should take example from you."

The fact Milan prosecutors had opened a case was first reported back in July when Il Giornale website wrote that the Italians would arrive in the mountains by minivan, paying huge bribes to pass checkpoints as they went, pretending to be on a humanitarian mission.

After a weekend shooting in the war zone, they would return home to their normal lives.

Gavazzeni described their actions as the "indifference of evil".

Prosecutors and police are said to have identified a list of witnesses as they try to establish who might have been involved.