Four people were killed Monday in the northern Iraqi city of Mosul when a roadside bomb went off and gunmen opened fire on a police patrol, local security chief Mohamed al-Jabouri said, dpa reported.
The incident, in the city located some 400 kilometres north of Baghdad, came as Arab League government ministers began arriving in the Iraqi capital ahead of this week's summit.
Finance and trade ministers are to meet on Tuesday, while foreign ministers are to meet on Wednesday.
The Arab League summit, scheduled for Thursday, will be Iraq's first pan-Arab conference in more than two decades.
The government has vowed to provide maximum security for the delegations attending the talks in the face of a series of deadly attacks in recent weeks.