Gangs have been terrorising areas of northern Nigeria in recent years, forcing thousands to flee and perpetrating mass kidnappings for ransom.
Bello said the latest incident, which he blamed on "terrorists", had happened on Sunday afternoon in the Shiroro local government area.
Local officials said last year that suspected Boko Haram militants were now present in Shiroro.
The Islamist group has been engaged in an insurgency in Nigeria's northeast for more than a decade.
"Terrorists, numbering over 100 are said to have invaded the community in broad daylight, killing about 11 Joint Security Taskforce members, several villagers and leaving many injured," Bello said, adding that scores of gunmen were killed during a gunfight with security forces.
Dahiur Muhammed, a resident of Galadiman Kogo village in Shiroro, told Reuters via phone that at least 30 villagers were killed and dozens more abducted after gunmen on motorbikes attacked three villages and set houses on fire.
Several people were fleeing to Niger state capital Minna where there is better security, he said.
Niger shares a boundary with the capital Abuja.
President Muhammadu Buhari said earlier this month that the military had begun a major operation in Niger state against bandits and Boko Haram insurgents running from a government offensive in the northeast.
Growing violence and insecurity in Africa's most populous country has stretched Nigerian security forces, who are often targeted by militants and armed gangs.
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