As more details emerge of the shooting spree and grenade attack in Belgium in which five people died, the BBC News website takes a look at other recent incidents in Europe - and the effect they have had on each country's laws. Norway Seventy-seven people were killed in twin attacks on 22 July 2011 in Norway. Anders Behring Breivik has admitted that he planted a car bomb that exploded close to government offices in the capital Oslo, killing eight people. He then drove... (GunPolicy.org)