BAGHDAD, Sept 14 (Reuters) - Two roadside bombs killed five policemen in northern Iraq on Sunday, part of a spate of attacks in a region where militants have stubbornly resisted major security offensives.

Police said the bombs blew up simultaneously in the town of Saadiya in Diyala province as a police patrol was passing. Five police were wounded, police added.

Attacks have killed dozens of people in the past few days in northern Iraq, where Sunni Islamist al Qaeda militants regrouped after being pushed out of traditional strongholds in Baghdad and western Anbar province.

On Saturday, gunmen kidnapped and killed three journalists from Iraq's independent Sharqiya TV station along with their driver in the northern city of Mosul.

Prime Minister Nuri al-Maliki has ordered a committee to be established to investigate the killing of the crew. Police say they have arrested five suspects.

Violence overall in Iraq has fallen to levels not seen since early 2004, but militants have shown they are still capable of carrying out large-scale attacks. (Reporting by Aws Qusay; Writing by Tim Cocks)

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