BAGHDAD, June 13 (Reuters) - Iraqi Prime Minister Nuri al-Maliki on Wednesday blamed Sunni Islamist al Qaeda and supporters of Saddam Hussein for an attack on a revered Shi'ite shrine in the city of Samarra.

Speaking on state television, Maliki said he believed other mosques could be targeted and that he had asked Iraq's security forces to step up security around them.

(Baghdad newsroom, editing by Paul Tait)

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