A US helicopter crash in eastern Afghanistan has killed 31 US special forces and seven Afghan soldiers, President Hamid Karzai's office says. US media reports that many of those killed were from the elite Navy SEALs. Neither the US nor Nato have confirmed the cause, but witnesses, officials and the Taliban say it was shot down. The incident is believed to be the biggest single loss of life for US forces in Afghanistan since operations began in 2001. The Chinook helicopter went down overnight in Wardak province, the statement from President Karzai's office said. It was returning from an operation...
