Following a brazen attack at a prison as covered in this HNGN article, a group of gunmen suspected of belonging to the terrorist group Boko Haram has killed four people in an ambush in Borno, a northeastern state in Nigeria.

The attack happened on the Damboa-Biu road near the remote village of Nwajurko, where a car carrying six people were ambushed by gunmen on Monday at about 9:30 a.m. (08:30 GMT), according to Yahoo! News.

A military source, who chose to remain anonymous, has described the attack. "Four of the passengers were shot dead by Boko Haram while two others who fled the ambush sustained injuries partly from gunshots," the source said.

The deaths of the four people were confirmed by Adamu Mamman of the civilian JTF, a grassroots community security group.

"When we heard of the ambush, we mobilized our men to go to the scene but unfortunately, we saw four people already dead," he said.

The fight against the terror group has escalated recently, with Nigeria's neighbors, Chad, Cameroon and Niger, joining in the fight. However, the Joint Multinational Intervention Force (MNJTF), which includes Benin, and whose fighting force numbers about 8,700, has yet to join in the action, reports NDTV.

The Boko Haram sect, which was born in Borno, has killed more than 600 people in a number of attacks that range from raids to bombings, since President Muhammadu Buhari, who promised to take down the terror group, rose to power on May 29 this year.