Nearly 100 people were killed and more than 150 injured on Saturday after an attacker detonated an “explosive-laden” ambulance in Kabul, the capital of Afghanistan.

The Taliban has claimed responsibility for what was described by one aid group as “a massacre.”

“The attacker used the ambulance to get through a security checkpoint in central Kabul, telling police he was taking a patient to a nearby hospital,” the Associated Press reports. “He then detonated his explosives at a second checkpoint.”

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