At least 20 people have been killed by a suicide bomber at a Shia mosque in the Iraqi town of Tuz Khurmato, with scores more wounded, police say.

The blast targeted worshippers attending a funeral at the mosque.Tuz Khurmato lies 175km (110 miles) north of the capital, Baghdad.

"The suicide bomber managed to enter and blow himself up in the middle of the mourners," Shallal Abdul, mayor of Tuz Khurmato, told the AFP news agency.