In 2018 there were no exact official figures on how many firearms are missing ; in Serbia authorities have given estimates ranging from 250,000 to 900,000 of different kinds are in circulation . In Bosnia , public reports state a figure of 750,000 . At the end of 2017 , a man entered a bus in Banja Luka carrying two bags with 36 hand grenades , three assault rifles , seven handguns , a mine and hundreds of cartridges with Gothenburg as the destination . He was stopped in the neighbouring country of Slovenia . A 26-year-old woman was stopped at the border to Croatia with three antitank weapons and a hand grenade . Police found four machine guns , three battle rifles , three assault rifles and a large quantity of explosives at the home of a 79-year-old man . According to a UNDP official , getting civilians to give up their arms to state authorities is complicated due to people are then forced to trust that authorities will protect them . Instead , criminals collect the weapons . Some of the missing weapons were used in the November 2015 Paris attacks during which 137 people were killed by jihadists . Other arms were assault rifles used in the 2015 Gothenburg pub shooting
2015 Gothenburg pub shooting
2015 Gothenburg pub shooting
Yugoslav Wars