American citizens were among those killed in the weekend attack on the Intercontinental Hotel in Kabul, US State Department officials told CNN.
The attackers were affiliated with the Pakistan-based Haqqani network, according to the Afghan Interior Ministry. The Taliban released a statement claiming responsibility.
Additional details, including the precise number of Americans killed, were not immediately available.
At least 18 people were killed during a 12-hour standoff with security forces after gunmen raided the hotel, Afghan authorities said.