Jihadists killed seven soldiers in attacks in northeast Nigeria, including an assault on a town where schoolgirls were abducted en masse two years ago, military sources and residents said on Tuesday.

In one assault on the town of Dapchi fighters believed to be from an Islamic State group affiliate killed one soldier and wounded three while looting shops and torching the house of a local leader, sources told AFP.

In a second attack on Monday near the village of Maza, fighters killed six soldiers after opening fire on a military convoy that had been hit by a landmine, two security personnel said.

In another incident on Monday, two female suicide bombers suspected to have been sent by Shekau's loyalists killed two people in the town of Konduga, security sources and residents said.

Jihadists also stormed the town village of Kautikeri and beheaded a local resident and abducted a herder along with 150 of his cattle, a local leader said.