Graphic photos: Genocide committed in Borno State?

I cannot verify the authenticity of what you are about to read and see
but according to a popular Muslim cleric, Dr. Ahmad Abubakar Mahmu
Gumi, who shared the photos on his Facebook page, he claims the men
lined up are young Almajiris who were executed without trial as Boko
Haram members in Borno state. He claims vigilante groups would move
into the villages, pick up young men, take them to the field and kill
them. He said this is how some innocent people are killed in the name
of fighting Boko Haram. He shared four photos...but viewer discretion
advised. It's quite graphic...