Afghanistan's Karzai slams United States over massacre

KABUL (Reuters) - Afghan President Hamid Karzai on Friday lashed out at the United States for failing to fully cooperate with an investigation into the massacre of 16 Afghan villagers by a U.S. staff sergeant and questioned whether only one soldier could have been involved.

A series of blunders by the United States, including the killings in Kandahar province on Sunday and the inadvertent burning of copies of the Koran at a NATO base last month, has further strained already tense relations between the countries.