Suicide car bombers launched twin attacks inside a police academy compound in the town of Tikrit on Sunday, killing at least seven people and wounding dozens, Iraqi police and doctors said. One bomber drove into the compound and blew up his vehicle among a crowd of policemen, killing several, according to accounts provided by witnesses to a reporter working for Reuters. As police and passers-by rushed to help those hit in the blast, a second car bomber entered the compound and detonated his vehicle, the witnesses said. A doctor at Tikrit's hospital, Mohammed Ayash, said seven bodies had been brought in and as many as 26 people were wounded. All those killed were police, while both civilians and police were among the wounded.Al Qaeda's wing in Iraq said that a pair from its "martyrs brigade" carried out the attack, according to an Internet posting. It was not possible to verify the authenticity of the statement. The bombings come amid a new wave of violence in Iraq, with a marked increase in bombings, suicide attacks, ambushes and assassinations this month.