A suicide car bomber attacked a police station on the outskirts of one of Iraq's major oil hubs on Saturday, killing at least four policemen and injuring eight, police said.
The attack came a day after the bombing of a key oil pipeline just east of the northern oil city of Beiji.
Saturday's explosion occurred at 9:30 a.m. at a police station about five kilometers north of the city center, police said.
Beiji - which lies 250 kilometers north of Baghdad - houses northern Iraq's largest oil refinery, and serves as a key transfer point for crude oil being exported out of Iraq. Attacks on the Kirkuk-Beiji pipeline cluster have been infrequent in recent months, with some 300 US soldiers and more than 2,000 Iraqi troops guarding the zone.
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