A suicide car bomber hit a police checkpoint Friday in western Ramadi, killing at least 20 people - two of them policemen - and wounding as many as 20, police in the Anbar provincial capital.
Anbar province has been a stronghold of the Sunni insurgency but many tribes in the region recently switched allegiance, with large numbers of military-age men joining the police force and Iraqi army in a bid to expel al-Qaida in Iraq fighters.
Suicide bombings are an al-Qaida trademark.
Police opened fire as the suicide car bomber sped toward a checkpoint 5 kilometers (3 miles) west of Ramadi, according to police Col. Tariq al-Dulaimi.
Nearby buildings were heavily damaged and police were searching the rubble for more victims of the 11:15 a.m. attack.
Two ballistic missiles attacked the US Navy destroyer USS Mason (DDG 87) from the territory of Yemen. The destroyer came to the aid of the hijacked Central Park tanker of Zodiac Maritime