US civilian killed in Afghanistan attack, Pompeo says

A U.S. civilian was killed Sunday in an attack on a United Nations vehicle in Kabul, Afghanistan, the State Department said.

Secretary of State Mike Pompeo on Tuesday identified the aid worker as Anil Raj, a U.S. citizen from San Francisco.

Secretary of State Mike Pompeo in the Oval Office of the White House as President Donald Trump meets with Bulgarian Prime Minister Boyko Borissov.

Secretary of State Mike Pompeo in the Oval Office of the White House as President Donald Trump meets with Bulgarian Prime Minister Boyko Borissov. (AP)

Five other aid workers were wounded in the attack in the Afghan capital.

Pompeo told reporters that attacks targeting U.N. personnel helping the Afghan people are "unconscionable."

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No one immediately claimed responsibility for the bombing, but both Taliban and the Islamic State (ISIS) are active in the capital and have repeatedly claimed previous attacks.

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In September, a U.S. service member was among at least a dozen people killed in a Taliban suicide car bombing near the U.S. Embassy in Kabul.

The Associated Press contributed to this report.