KANO, Nigeria — A police spokesman says authorities have found 10 unexploded car bombs in a northern Nigeria city where an attack by a radical Islamist sect killed more than 150 people.

Kano state police spokesman Magaji Musa Majiya said Monday that officers found one near a police station in the state capital of Kano, which was attacked by the sect known as Boko Haram. Majiya said officers have disarmed the explosive.

Majiya also said officers have found other locally made explosives.

The Nigerian Red Cross estimates more than 150 people died in Friday's attack in Kano after at least two Boko Haram suicide bombers detonated explosive-laden cars. The attack hit police stations, immigration offices and the local headquarters of Nigeria's secret police, leaving corpses in the streets across the city.