During the Bosnian War siege of Sarajevo, a number of predominantly ethnic Serb residents of the besieged city were murdered by forces allegedly under the command of Mušan Topalović, known as "Caco," who led the 10th Mountain Brigade of the Army of the Republic of Bosnia and Herzegovina. Topalović, a pre-war rock musician and gangster, along with fellow paramilitary commander Ramiz Delalić, controlled large parts of the besieged capital, exercising authority over neighborhoods, black market activity, forced recruitment, kidnapping for ransom, and reportedly organized rapes. His forces are alleged to have executed more than 400 Serb fighters and civilians. Victims were rounded up, beaten, and killed — often by having their throats slit or being decapitated — before their bodies were pushed into the Kazani pit, located on Mount Trebević roughly 1.5 kilometers south of the city center.
Jovan Divjak, an ethnic Serb general in the Bosnian army, informed Bosnian president Alija Izetbegović of these crimes in a five-page letter dated May 27, 1993, listing more than a dozen victims who had been abducted and killed. The magazine Dani was among the first publications to report on Topalović's crimes against Sarajevo's Serbs, publishing a January 1993 article documenting 22 incidents in which 39 people were confirmed killed.
On October 26, 1993, Bosnian authorities launched "Operation Trebević 2," targeting renegade paramilitary units including Topalović's brigade. Police disbanded the group, arrested 16 soldiers, and killed Topalović during the operation. Accomplices were later tried at the Sarajevo Military Court and received what have been described as minimal sentences: four men — Esad Tucaković, Zijo Kubat, Refik Čolak and Mevludin Selak — were convicted and sentenced to six years each, while eight others received ten-month sentences for failing to report crimes. In total, 14 soldiers were convicted of various atrocities, most serving only a few months. During his trial, Tucaković described killing a couple, Vasilij and Ana Lavriv, by slitting Vasilij's throat and decapitating Ana before disposing of her body in the pit.
An exhumation of the mass graves recovered 29 bodies before it was halted by order of the Interior Ministry, according to former Sarajevo police chief Munir Alibabić, who oversaw the investigation and suspected the halt was politically motivated. Of 15 identified victims, 10 were Serbs, two Ukrainian, two Croat, and one Bosniak. Overall death toll estimates range from a few dozen to several hundred; Federation of Bosnia and Herzegovina officials have estimated at least 150 Serb civilians were killed in Sarajevo during this period. Public commemorations began in 2014, and a monument was installed at the site in November 2021, though victims' families and advocacy groups objected to the omission of perpetrators' names from the memorial plaque.