To quote ABC News:
Saturday's deaths bring the total number of coalition troops killed in Afghanistan to 334 this year, according to the Associated Press.
The last worst one-day U.S. causality record in Afghanistan was on June 28, 2005 when 16 U.S. soldiers were killed in Kunar province after a helicopter was shot down by Taliban insurgents.
Afghan President Karzai's office released a statement on the incident.
"A NATO helicopter crashed last night in Wardak province," Karzai said in the statement. "President Karzai expressed his deep condolences because of this incident and expressed his sympathy to Barack Obama."
President Obama offered his thoughts and prayers to those killed in the crash.
"Their deaths are a reminder of the extraordinary sacrifices made by the men and women of our military and their families, including all who have served in Afghanistan," Obama said in a statement. "We will draw inspiration from their lives, and continue the work of securing our country and standing up for the values that they embodied. We also mourn the Afghans who died alongside our troops in pursuit of a more peaceful and hopeful future for their country. At this difficult hour, all Americans are united in support of our men and women in uniform who serve so that we can live in freedom and security."
More after the jump.