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Doctors Without Borders contacted officials more than a dozen times during the hour-long bombing of its hospital in Afghanistan last month, according to a preliminary report released by the group on Thursday.

More than a month after a U.S. airplane bombed the hospital after Afghan forces called in for support, the military has yet to release any information as to why the hospital was struck in an act some organizations are calling a war crime.

The Doctors Without Borders report said the bombing started around 2 a.m. on Oct. 3, and lasted about an hour. Officials with the medical group in Kabul contacted officials with the U.S.-led military mission for the first time at 2:19 a.m., saying that the hospital had been hit by an airstrike.

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