Pentagon 'assessing' reports of civilian casualties following strike

"We take it very, very seriously," Kirby told reporters at the Pentagon on Monday.

American forces launched a drone strike in Kabul on Sunday that killed a suicide car bomber suspected of preparing to attack the airport, U.S. officials said, as the United States nears the end of its military presence in the Afghan capital.

The strike, first reported by Reuters, was the second carried out by U.S. forces in Afghanistan since an Islamic State suicide bomber struck the airport on Thursday, killing 13 U.S. troops and scores of Afghan civilians trying to flee the country.

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