"Don't worry, we're soldiers," one 16-year-old girl recalls them saying. "Nothing is going to happen to you."
The gunmen commanded the hundreds of students at the Chibok Government Girls Secondary School to gather outside. The men went into a storeroom and removed all the food. Then they set fire to the room.
What the students came to know was chilling: The men were not government soldiers at all. They were members of the ruthless Islamic extremist group called Boko Haram. They kidnapped the entire group of girls and drove them away in pickup trucks into the dense forest.
Their plight, and the failure of the Nigerian military to find them, has drawn international attention to an escalating Islamic extremist insurrection that has killed more than 1,500 so far this year.
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Boko Haram has in a video seen yesterday claimed responsibility for the mass kidnapping and threatened to sell the girls.
The British and US governments have issued statements of concern over the fate of the missing students, and protests have erupted in major Nigerian cities and in New York.
The AP also interviewed about 30 others, including Nigerian government and Borno state officials, school officials, six relatives of the missing girls, civil society leaders and politicians in northeast Nigeria and soldiers in the war zone. Many spoke on condition of anonymity, fearing that giving their names would also reveal the girls' identities and subject them to possible stigmatisation in this conservative society.
The Chibok girls school is in the remote and sparsely populated northeast region of Nigeria, a country of 170 million with a growing chasm between a north dominated by Muslims and a south by Christians. Like all schools in Borno state, Chibok, an elite academy of both Muslim and Christian girls, had been closed because of increasingly deadly attacks by Boko Haram. But it had reopened to allow final-year students to take exams.