The deaths of 10 medical aid workers in northeastern Afghanistan last week appear to be the work of insurgents from outside that remote corner of the country, an international humanitarian aid organization said Thursday.

"Our own research suggests that the murders were not a robbery as initially reported in the press," said a statement from the International Assistance Mission (IAM). "We are now working on the assumption that the attack was an opportunistic ambush by a group of non-local fighters."

Gunmen shot and killed the 10 members of the medical team a week ago in Badakhshan, a remote northeastern region.

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