President Barack Obama mourned the deaths of 31 U.S. special operations troops in a helicopter crash in Afghanistan.

He said it’s a reminder of the “extraordinary sacrifices” being made by America’s military and its families.

An American official said the helicopter appears to have been shot down on Saturday in eastern Afghanistan in the deadliest single combat incident of the decade-long war.

Mr. Obama learned of the deaths while at Camp David. In a written statement, he said Americans’ thoughts and prayers go out to the families of those who perished. He also mourned the loss of seven Afghan soldiers killed in the crash.

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