Two children who were armed with explosives blew themselves up near a camp in northern Cameroon housing civilians displaced by Nigeria’s Boko Haram militants.

The incident occurred on Friday when nine people were killed and 30 were injured, according to officials.

The children entered the town of Kolofata before dawn from the border with Nigeria, posing as refugees.

“Two suicide bomber adolescents aged between 10 and 15 years infiltrated the town of Kolofata,” Communications Minister Issa Tchiroma Bakary told state radio.

“The death toll is 11, including the two suicide bombers, and 30 wounded, of which 10 are seriously wounded,” he added.

According to a local government, ten people who were gravely wounded had been transported to a hospital in a nearby town.

“It was unbearable. People were screaming. Others were moaning. It was total horror,” said a policeman who was present at the scene of the terrorist attack.

In recent years, Northern Cameroon has suffered from the Nigerian-based Boko Haram militant group.

The terrorist group frequently attacks the border and has killed more than 20,000 people in the Lake Chad region and.

According to the latest UN refugee agency figures, Boko Haram has displaced 2.7 million people in recent years.