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BAGHDAD, May 14 (Reuters) - A suicide bomber killed 20 people and wounded dozens on Wednesday at funeral being attended by Sunni Arab tribesmen opposed to al Qaeda west of Baghdad, Iraqi police said.

Police said the bomber blew himself up inside the funeral tent in the village of Abu Munasir in Anbar province.

There was no claim of responsibility, but suspicion is likely to fall on Sunni Islamist al Qaeda militants.

Al Qaeda is blamed for most suicide attacks in Iraq, and has regularly warned it would target Sunni Arab tribes that have joined forces with the U.S. military to fight the group.

Anbar, in western Iraq, was once an al Qaeda stronghold until Sunni Arab tribes and U.S. forces drove the group out in late 2006 and 2007.

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