A U.S. military team rammed the gate to the destroyed Doctors Without Borders hospital in Afghanistan, further heightening tensions between the aid group and the U.S. military.

The U.S. troops were traveling in an Afghan-owned tracked vehicle to the site of the hospital in Kunduz on Thursday to assess the structural integrity of the building and decide if it could be rebuilt, Pentagon spokesman Capt. Jeff Davis told reporters on Monday.

The U.S. service members had not contacted Doctors Without Borders about the visit to the hospital and believed there were no personnel in the structure, so they drove into the gate with the vehicle to force it open, Davis said.

There were, however, Doctors Without Borders personnel inside the hospital who were "understandably not happy" with the U.S. destruction of more of their property, Davis said.

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