evidence: A military helicopter was shot down in eastern Afghanistan, killing 31 U.S. special operation troops, most of them from the elite Navy SEALs unit that killed al-Qaida leader Osama bin Laden, along with seven Afghan commandos. It was the deadliest single incident for American forces in the decade-long war. [...] The death toll would surpass the worst single day loss of life for the U.S.-led coalition in Afghanistan since the war began in 2001 — the June 28, 2005 downing of a military helicopter in eastern Kunar province. In that incident, 16 Navy SEALs and Army special operations troops were killed when their craft was shot down while on a mission to rescue four SEALs under attack by the Taliban. Three of the SEALs being rescued were also killed and the fourth wounded. It was the highest one-day death toll for the Navy Special Warfare personnel since World War II. [...] Taliban spokesman Zabiullah Mujahid said in a statement that Taliban fighters downed the helicopter during a "heavy raid" in Sayd Abad. He said NATO attacked a house in Sayd Abad where insurgent fighters were gathering Friday night. During the battle, the fighters shot down the helicopter, killing 31 Americans and seven Afghans, he said, adding that eight insurgents were killed in the fight.