A total of seven US troops died in the country yesterday, with two members of the special operations forces shot dead by an Afghan policeman in the eastern province of Wardak. Ten US troops were wounded in the attack. In August last year, a US military helicopter crashed during a firefight with insurgents in Kandahar, killing seven Americans and four Afghans. Insurgents shot down a Chinook in August 2011, killing 30 US troops in Wardak province.