Pistol used by Isis mass killer Anis Amri on sale on Euro black market for just £125
Experts estimate there are between 3 million and 6 million guns on sale
ISIS terrorist Anis Amri gunned down a Polish trucker and an Italian cop with a pistol for sale on the black market for just £125.
The killer's 22 calibre weapon was photographed next to his body minutes after he was killed in a shoot out in Milan.
Experts from the Switzerland-based Small Arms Survey believe there are between 3 million and 6 million guns left over from wars in the Balkans during the 1990s.
A handgun is no more than 150 euros (£125) and more expensive weapons like AK-47s semi-automatic rifles will cost just 700 euros.
reveals how one arms dealer told how guns are being sold to terror groups "all the time".
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He said: "There are plenty of nooks and crannies in a car or truck where you can hide a disassembled gun. People hide them in the fuel tank."
Ivan Zverzhanovski, who runs a UN project in Belgrade to reduce gun crime said: "You don't know where these weapons are, who holds them or how they are being used.
"You don’t need hundreds of thousands of weapons. You just need enough to create havoc."
Amri murdered 12 people and injured 48 more by driving a lorry through a packed Christmas market in Germany on Monday.
It's now been revealed he pledged to die for ISIS and met and spoke with known hate preachers and extremists with links to terror warlords.
These groups have access to guns, or have to money to buy them, especially ones smuggled back into Europe by the thousands of Isis fighters who have returned from Syria.