Boko Haram violence has uprooted 800,000 children, report says

The children's drawings show men with guns, a coffin, a car exploding. One picture has stick-like figures of eight siblings missed by their teenage sister.

The disturbing images come from some of an estimated 800,000 children forced from the homes by Boko Haram fighters, according to a UNICEF report published Monday.

It says the number of refugee children has doubled in the past year, making them about half of all the 1.5 million Nigerians made homeless.

"Children have become deliberate targets, often subjected to extreme violence — from sexual abuse and forced marriage to kidnappings and brutal killings," the report says. "Children have also become weapons, made to fight alongside armed groups and at times used as human bombs."

The number of children absent from primary school in Nigeria has increased from 8 million in 2007 to 10.5 million — the highest figure in the world, it says. Boko Haram has targeted schools, destroying or severely damaging more than 300 and killing 314 students and 196 teachers, UNICEF says.