Men fill gas canisters with explosive for usage with a cannon named "Borkan" (Volcano) inside a weapon factory in Aleppo countryside March 5, 2015. The "Borkan" is made out of four tubes attached to a loader, which can fire four shells at a time, and have a range of three kilometres (1.86 miles). Picture taken March 5, 2015. REUTERS/Abdalrhman Ismail (SYRIA - Tags: CIVIL UNREST CONFLICT)