ABUJA, Sept. 17 (Xinhua) -- Two senior police officers were shot dead Thursday and another seriously wounded as gunmen invaded a town in Nigeria's northwestern state of Sokoto, police said.

About 100 gunmen dressed in army camouflage attacked Gidan Madi town of Tangaza local government area in the state, engaging police in a gunfight early Thursday, Sadiq Abubakar, a police spokesman, told the press.

Police authorities confirmed Aliyu Bello, head of the divisional police headquarters in the town, and Muhammad Abdullahi, a senior inspector, were killed in the attack.

A team of senior police officers has been drafted to investigate the incident, Abubakar added.