BAGHDAD (Reuters) - Bombs exploded across the Iraqi capital Baghdad on Monday, killing at least 22 people, police said.

Five of the six blasts were in mainly Shi'ite Muslim districts, but there was also an explosion in the predominantly Sunni Muslim neighbourhood of Doura.

In the deadliest attack, a parked car bomb blew up in a commercial street in Husseiniya, killing five people, police said. There was no immediate claim of responsibility for the attacks.

Sunni Islamist insurgents including al Qaeda have been regaining momentum this year in a campaign to destabilise Iraq's Shi'ite-led government and foment intercommunal conflict.

More than 6,000 people have been killed across the country this year, according to monitoring group Iraq Body Count, reversing a decline in sectarian bloodshed that had reached a climax in 2006-07.

The civil war in neighbouring Syria has put acute pressure on Iraq's delicate sectarian balance, which was already under strain from political feuds between the country's Sunni, Shi'ite and ethnic Kurdish factions.

(Reporting by Kareem Raheem; Writing by Isabel Coles; editing by Mark Heinrich)