Attackers fired a rocket that struck a Baghdad hotel housing foreign contractors and journalists early today. There were no reported casualties.
The rocket hit the Sheraton hotel, guards said. The lobby, which has been attacked before, was strewn with glass.
The rocket slammed into a sixth-floor concrete ledge that forms the roof of a banquet room, said security guard Rabah Nasser.
Earlier, guards had said the hotel was struck by a rocket-propelled grenade.
Across the Tigris river, sirens wailed briefly in the area housing the US-led coalition headquarters.
A US military spokesman said he had no information.
US soldiers protect the Sheraton hotel and the neighbouring Palestine hotel, both of which are ringed by concrete blast walls to ward off bombing attempts.