Four Iraqi policemen have been killed and four others wounded after a suicide bomber blew himself up near the western city of Ramadi, a police official says, Press TV reported.

The attack happened around 10.30 am (0830 GMT) 10 kilometers (six miles) north east of Ramadi, the capital of Anbar province on Sunday, AFP reported.

"The suicide bomber blew himself up at the gate at the entrance to the police station, causing the casualties," the police official said.

Later on Sunday, a roadside bomb exploded near a playground in the northern city of Mosul, killing a young boy and injuring four others.

The attack occurred at around 7:00 pm (1600 GMT) in the city's west, a police official said.