Nigerian security forces said troops have killed at least 40 Islamist fighters in Borno state, after foiling an assault on its units by the fighters.
The military said on Tuesday it repelled coordinated attacks in three parts of the state.
"Terrorists ... of unknown strength attempted coordinated simultaneous attacks on Bama, Gwoza and Pulka" on Sunday night, Captain Aliyu Danja, a military spokesperson in Maiduguri, the Borno state capital, was quoted by news agency Reuters as saying.
Mr Danja said the military had successfully repelled all the attacks, killing 40 terrorists in the three locations while several others escaped with gunshot wounds.
He said troops destroyed a pick-up truck loaded with bombs. He added that separately, air strikes on a Boko Haram base in Kilani had "neutralized" fighters there, he added.
The figures could not be independently verified.
The military's statement came as London-based human rights body, Amnesty International, called for investigations into the alleged deaths of hundreds of people in detention facilities during a crackdown on Islamist groups in Nigeria, saying it has evidence.
In a report on Tuesday, Amnesty said that "credible information" from a senior Nigerian army officer indicated that more than 950 people suspected of having links to Boko Haram died in military custody in the first six months of this year.