Car bombs exploded at three checkpoints on the western outskirts of Iraq's holy city of Samarra on Thursday, martyred three people and wounding 41 others, a security official and locals said.
Samarra in central Iraq, 125 km (80 miles) north of Baghdad, is home to a significant Shia Muslim shrine and has been under attack since the ISIS militants swept through most areas north of the capital in June.
The three bombs before sunrise on Thursday martyred a civilian and two policemen as well as wounding dozens of others, and were followed by a hail of rocket and mortar fire, the official said.
Then, after several hours of fighting with security forces, extremist militants retreated under fire from Iraqi warplanes, he said.
The ninth century al-Askari shrine in Samarra was blown up by extremist militants in February 2006.
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