At least eight people have been killed outside a church in north-eastern Nigeria in an attack carried out by suspected members of Boko Haram terror group. Gunmen on bicycles attacked worshippers who had attended the morning service at the church in the Kwamjilari village, in the restive Borno state.

"Unknown to the residents, the gunmen had stationed some of their comrades on the road leading out of the village and they shot anyone who tried to flee," a survivor was quoted by the Vanguard newspaper as saying. "Many people ran into the bush with gunshot wounds. But so far we can only confirm eight deatth."

Witnesses added the attackers also set on fire houses and fields of maize that were almost ready for harvest.

Borno is the epicentre of Boko Haram's insurgency, which has resulted in the death of at least 20,000 people since 2009. Kwamjilari is close to the Chibok village, where more than 200 girls were kidnapped by Boko Haram in 2014.

Although the Chibok abduction was not the first mass-kidnapping carried out by the terrorists, it was the only one that attracted international outrage. It led to the creation of the global movement Bring Back Our Girls which shone a spotlight on the deadly insurgency of Boko Haram that had previously been under-reported.

Nigeria is spearheading an ongoing regional offensive against Boko Haram. The task force consists of 8,700 troops from Nigeria, Niger, Chad, Cameroon and Benin.

The joint offensive has scored some success, such as the recapture of several territories and the release of thousands of civilians previously held captive.

The Nigerian army and government have often claimed the fight against Boko Haram was over. Nigeria's President Muhammadu Buhari declared a technical victory over the insurgents in December 2015.

However, Boko Haram still carries out attacks, with security experts warning that underlying issues such as disenfranchisement, poverty and strong links with the Islamic State (Isis) will continue to pose major threats to stability in the region.

In August, the Nigerian army's claim it had "fatally injured" Abubakar Shekau, the contested leader of Boko Haram.

Nigeria Borno malnutrition Lake Chad
Women and children stand next to a makeshift shelter in a camp occupied by displaced families who fled from Boko Haram attacks Issouf Sanogo/AFP