A large explosion rocked Afghanistan's capital near the US Embassy in the early hours of Wednesday on the anniversary of the 9/11 attack on the United States.
A plume of smoke rose over Kabul just after midnight and sirens could be heard. An embassy employee reached by phone confirmed the explosion but had no details. There was no immediate official comment.
It would be the first major attack in the Afghan capital since President Donald Trump abruptly called off US-Taliban talks over the weekend, on the brink of an apparent deal to end America's longest war.
Two Taliban car bombs shook Kabul last week, killing several civilians and two members of the NATO mission. Trump has cited the death of a US service member in one of those blasts as the reason why he now calls the US-Taliban talks "dead."