(adds details, witnesses)

BAGHDAD, Nov 8 (Reuters) - Two suicide bombers killed eight people and wounded 14 in an attack on a police headquarters just outside the western Iraqi city of Ramadi on Saturday, police said.

Two police captains who saw the bombing told Reuters four of the dead were policemen and the others civilians.

The bombers detonated their explosive vests simultaneously outside the station, Captain Shakir Aswad said.

But another police captain, Mohammed Hatim, said he thought at least one of the bombs was a suicide car bomb driven towards the station.

It was not clear whether the second bomber had contributed to the casualties or whether all had gone down with the first.

Violence has fallen sharply in Iraq over the past year and last month saw the lowest number of violent deaths amongst U.S. troops and Iraqi civilians since the 2003 U.S.-led invasion.

But militants have shown themselves still capable for carrying out devastating, large-scale attacks. It was unclear who was behind the blasts in Ramadi but suicide attacks are a favourite tactic of Sunni Islamist al Qaeda. (Reporting by Aws Qusay; Additional and Khalid al-Ansary; Writing by Tim Cocks; Editing by Angus MacSwan)

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