Suicide bomber infiltrated a line of young men waiting in front of police recruit centre in Iraqi city of Tikrit suburb wearing a vest filled with explosives, killing at least 42 and wounding over 100 persons, officials said.

“Who else would it be but al Qaeda, who keep on slaughtering us. They are the terrorists."," said Abdul-Jabbar, deputy governor of Salahuddin province, where the attack took place, Reuters reports.

A police spokesman said that, at the time of the attack, more than 300 Iraqi men were standing in line in front a police recruiting centre with their documents, where they were lining up hoping to get a job as a police trainee.

Hospitals are full of dead and injured, and citizens are being called from mosque speakers to donate blood.

The attack happened in former dictator Saddam Hussein's hometown of Tikrit, 150 km north of Baghdad, and province Salahuddin is often a target of attacks rebellious Islam Sunnites are held responsible for, as they are opposition of ruling Shiites in Baghdad. Majority of Tikrit citizens are Sunnites.