In Afghanistan, four Nato personnel have been killed after their helicopter was shot down in the Sangin district of Helmand province. <br/><br/>Nato officials said the aircraft was hit by hostile fire without revealing the nationalities of those killed. <br/><br/>Meanwhile, the Taliban said its fighters had shot down the helicopter with a rocket-propelled grenade. Its spokesman Yousuf Ahmadi said the aircraft crashed in the Sangin district bazaar this morning.<br/>