Kano - Six people are missing following an ambush by suspected extremists on a humanitarian convoy in northeast Nigeria’s Borno state, an aid group said on Friday.

Action Against Hunger (ACF) said in a statement that a member of staff was among the missing after the convoy was ambushed in Kennari, a village outside Damasak Town near the border with Niger.

“One of the drivers was killed, while one Action Against Hunger staff member, two of the drivers and three health workers are missing,” ACF said.

“We are deeply saddened by this tragic incident as these are colleagues dedicated to providing life-saving assistance,” they added.

A statement by the United Nations’ humanitarian coordinator, Edward Kallon, said he was “deeply disturbed” by the attack.

“I call on all who may have influence to do everything they can to keep them unharmed and work towards their safe return,” he said.

A Daesh group has been active in the area, repeatedly attacking military bases.

The three-vehicle convoy was returning to Damasak from Layi village where ACF runs a clinic for locals when the gunmen opened fire, according to a humanitarian source who spoke on condition of anonymity.

One of the vehicles veered off the road and crashed into a tree, killing the driver.