Mosul, Iraq  - Six policemen were killed in three separate attacks over the past 24 hours in the northern Iraqi city of Mosul, police said Saturday.

An improvised explosive device exploded outside the home of Mohammed Taha, a police officer from a village south of Mosul, late on Saturday afternoon, police in Mosul told the German Press Agency dpa.

Police on Saturday said they had also found the body of a dentist abducted from the street in front of his house the night before.

In an unrelated incident, four policemen were killed and three others injured when a roadside bomb exploded as they patrolled the eastern Mosul district of al-Sussi late on Friday night, police said.

In a separate incident, also Friday night, unknown attackers fatally shot a policeman and injured another in Mosul's al-Haramat neighbourhood before escaping.

Mosul, about 400 kilometres north of Baghdad, has been the site of near-daily deadly attacks in recent months, despite successive security pushes that police say have netted hundreds of suspected militants.

On Saturday, police in Mosul said they had arrested four more men suspected of launching attacks against Iraqi security forces and civilians in a raid on a house in a southern district of the city.  (dpa)