Authorities say two police officers were killed and two others wounded in an attack in a northern Nigeria city.
The attack happened Thursday morning in Kano, a city of 9 million in Nigeria's Muslim north. Police said in a statement that gunmen riding on motorcycles shot at a group of officers patrolling a street on foot.
The shooting comes after at least 185 people died in Kano last month in a coordinated assault by the radical Islamist sect known as Boko Haram.
Boko Haram is waging an increasingly violent campaign against Nigeria's weak central government across its north.