BAGHDAD (AP) — Officials say bombings in Baghdad and the northern city of Kirkuk killed at least 42 people in Iraq on Saturday as the government investigated a deadly attack on a Sunni mosque the day before that has heightened sectarian tensions amid a fragile political transition.

In oil-rich Kirkuk, long disputed by Baghdad and the Kurdish regional government, the deputy police chief says three bombs went off in a crowded commercial district, killing 31 people and wounding dozens.

Earlier in Baghdad, according to police officer, a suicide bomber drove an explosives-laden car into the gate of the intelligence headquarters in Karrada district, killing six civilians and five security personnel. He says 24 other people were wounded.

Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.