At least 25 people died when gunmen attacked a prison, a police station, a bank and a bar in Ganye, a Local Government Area of Adamawa State, police said.
The attacks happened on Friday but the death toll was only reported on Saturday.
No group has said it carried out the attack but police said they suspected Islamist militants Boko Haram.
“We have 25 dead from yesterday’s attacks in Ganye which included a chief prison warder, a policeman and a prominent politician,” Adamawa state police chief Mohammed Ibrahim was quoted by AFP news agency as saying.
The gunmen – armed with bombs, machine-guns and rocket-propelled grenades – set free an unspecified number of inmates from the prison, officials said.
Mr Ibrahim said seven people were shot dead in the bar and six near the bank, while others were gunned down either outside their homes or on the streets.
It was not clear how much money had been looted from the bank.
In a separate incident, two suspected suicide bombers died in Kano on Saturday when their explosives went off prematurely, police said.
Three policemen were injured in the blast, Kano state police chief Musa Daura said.