Baghdad, Iraq (CNN) -- At least 12 police officers were killed and 20 others wounded when a suicide bomber drove his explosive-laden vehicle into the federal police headquarters in the city of Samarra, authorities said.
The attack took place in the al-Ashaq district of Samarra, police said.
Samara is located in the predominantly Sunni province of Salaheddin, about 100 kilometers (62 miles) north of Baghdad.