Four members of the Federal Police were killed and five were wounded in an armed attack east of the Iraqi Tikrit. A police source in Salahuddin told the National Iraqi News Agency (NINA) that unidentified gunmen attacked at dawn today a Federal police checkpoint by mortars and RPGs in the Dor district, east of Tikrit, killing four policemen, wounding five others and destroying a police wheel.The source added that a security force rushed to the scene and transported the injured to a nearby hospital for treatment, and the dead bodies to the forensic medicine department.The security force also began raids and searches operation for the perpetrators of the attack.