Baghdad
A suicide bomb attack in the car on a police checkpoint in Baquba killed at least four people and wounded 33 others Thursday, police officials.
Two of the dead and nine policemen were injured, authorities said, who said that the attack shows signs of al Qaeda in Iraq.
During the attack, a suicide bomber drove a minibus packed with explosives at the main entrance of the Diyala police headquarters in downtown Baqouba. Headquarters is preparing an exhibition of arms and ammunition seized by Iraqi security forces by insurgents in 2010.
Separately Shiite pilgrim was killed and nine wounded in southern Baghdad, in the region of al-Dora, on Thursday when a bomb hit a procession of Shiite pilgrims who made the trip three days at the foot of Karbala for the Arbaeen , police said.
A suicide bomber kills 16, wounds dozens
Arbaeen is a religious practice that falls after 40 days of mourning for Imam Hussein, grand son of Prophet Muhammad who was killed in a seventh century battle in the Iraqi city.
Tens of thousands of Shiites head to Karbala for the respect, and fear of further bloodshed before Arbaeen commemoration of next week.
Diyala governor Abdul Nasir al-Mahdawi and Diyala provincial council has put the Iraqi security forces on high alert in anticipation of further attacks.
The violence marks the third consecutive day of deadly suicide bombings in Iraq.
suicide bomber hit a couple of places in the province of Diyala on Wednesday, killing at least 16 people and wounded nearly 100 others, officials said.
Tuesday, 65 people were killed and 160 wounded in a suicide bombing that targeted the recruitment of central Tikrit.
Five others - all Shiite pilgrims - were injured Tuesday in a separate attack in Taji, north of Baghdad.
Diyala is a stronghold of Al Qaeda until 2008, when Iraqi security forces backed by U.S. troops, conducted major military operations in the province to push the militants.
Awakening Councils also play an important role in the hunt for Al Qaeda fighters in the province. Awakening Councils, whose members are predominantly Sunni, have been recruited by the U.S. military to act against al-Qaida in Iraq and other militias.