A US embassy convoy was hit by a suicide car bomber in the Afghan capital of Kabul on Monday, resulting in the deaths of some people, police said.
It was not immediately known if the dead included American nationals, but an embassy spokesman said US Ambassador Ronald Neumann was not in the convoy.
Several embassy officials and pedestrians were wounded, spokesman Joe Mellocc said, adding that the injuries of some officials were "serious".
Earlier, a police officer at the scene said he thought some people were killed. But Mellocc said he was unaware of any deaths.
The attack took place on a main road leading east, which is often used by NATO and US-led coalition troops.
Western troops had sealed off the site of the attack, one police officer told the agency from the scene, and a helicopter hovered above.
The attack comes amid an increase in Taliban raids -- including suicide attacks -- in recent weeks as fighting picks up after a relative winter lull.
NATO launched an offensive in the south this month to pre-empt a spring offensive by the rebels.