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BAGHDAD, May 7 (Reuters) - Two suicide car bombers killed 20 people and wounded more than 40 in separate attacks near Iraq's city of Ramadi on Monday, police said.

The first car bomb went off in a busy market in a town called Albu-Thiyab, east of Ramadi, said Tareq al-Thiyab, a police colonel and a government security adviser in western Anbar province.

The second car bomb targeted a police checkpoint in a town called al-Jazeera, he said.

Sunni Islamist al Qaeda is engaged in a fierce power struggle with local Sunni Arab tribesmen in Anbar province, who oppose the group's campaign of indiscriminate attacks and its efforts to impose a harsh interpretation of Islam.

Recent big suicide attacks in Anbar, an overwhelmingly Sunni province west of Baghdad, have been blamed on al Qaeda.

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