The attack came a day after a suicide bomber detonated his explosives-packed vest in the middle of a crowd of police recruits in the central city of Tikrit, killing 50 people and wounding up to 150.
Iraq rocked by second bombing in as many days
BAQUBA // A suicide bomber rammed an ambulance packed with explosives into a security headquarters on Wednesday, killing 13 people in the second major attack against Iraqi forces in as many days.
A second suicide attack in a nearby town killed two others and wounded a top provincial official, shattering a relative calm in Iraq following the formation of a new government by Prime Minister Nouri al Maliki last month.
"We have so far received 13 bodies, and are treating 64 wounded," Firaz al Dulaimi, a doctor at Baquba hospital, said, referring to the first attack on Wednesday morning in the Diyala provincial capital.
The bombing occurred at 10am local time in the middle of Baquba, an ethnically mixed city north of Baghdad. It targeted an office of the Force Protection Service, the agency responsible for securing the country's government buildings
About 90 minutes later in the nearby town of Ghalbiyah, a suicide bomber blew up his explosives-filled car in the midst of a crowd of Shiite pilgrims, killing two people and wounding 16, an official in the provincial security command said.
Among the wounded were the Diyala deputy governor, Sadiq al Husseini, and three of his bodyguards.
Mr al Husseini was visiting with worshippers as they gathered ahead of commemorations for Arbaeen, which marks 40 days since the anniversary of the death of the revered seventh century Shiite Imam Hussein.
Baquba, and Diyala province, was an al Qa'eda stronghold as recently as 2008. While violence has dropped off dramatically both in Diyala and nationwide since then, the province remains one of Iraq's least secure.
The attacks came a day after a suicide bomber detonated his explosives-packed vest in the middle of a crowd of police recruits in the central city of Tikrit, killing 50 people and wounding up to 150.
It was the deadliest attack to hit Iraq in more than two months, and the first major strike since Mr al Maliki named a new cabinet on December 21, ending nine months of stalemate after March elections.
Tikrit's police chief, Col Ibrahim al Juburi, and the head of the city's emergency response squad, Brig Gen Mohammed Majeed, were fired in the aftermath of the blast.
* Agence France-Presse