The mass abduction of more than 100 girls by gunmen in the northeastern state of Borno late Monday came just hours after a bomb ripped through a packed bus station on the outskirts of Abuja, killing 75 people, the deadliest attack ever in the capital.
The bombing was also blamed on Boko Haram, a group whose five-year extremist uprising has shaken Africa's most populous country and top economy.
"The girls told us they were taken to the Konduga district part of Sambisa forest by their captors," said Zanna, referring to an area where Boko Haram is known to have well-fortified camps.
His account was supported by two other Chibok residents who asked that their names be withheld.
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The girls said they ran after getting permission from the gunmen to use the bathroom and were helped back to Chibok by nomadic herdsmen from the Fulani ethnic group.
Borno's Governor Kashim Shettima told journalists that 14 of the hostages had escaped so far and offered USD 300,000 to anyone with information that leads to the others being rescued.
Shettima voiced outrage at Boko Haram, a group which says it wants to create a strict Islamic state in northern Nigeria.
"In Islam, women and children are spared during war," Shettima said.
The gunmen stormed the Government Girls Secondary School after sundown, torching several buildings before opening fire on security forces guarding the school.
Intensifying violence in the group's northeastern base has forced school closures across the region, including at Chibok, but the girls were reportedly told to return this week to write end-of-term exams.
Witnesses said the gunmen killed a police officer and soldier in the shootout and ultimately forced their way into the school.