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Strapped with a booby-trapped vest and sent by the extremist Boko Haram group to kill as many people as possible, the young teenage girl tore off the explosives and fled as soon as she was out of sight of her handlers.

Her two companions, however, completed their grisly mission and walked into a crowd of hundreds at Dikwa refugee camp in northeast Nigeria and blew themselves up, killing 58 people.

Later found by local self-defense forces, the girl's tearful account is one of the first indications that at least some of the child bombers used by Boko Haram are aware that they are about to die and kill others.

"She said she was scared because she knew she would kill people. But she was also frightened of going against the instructions of the men who brought her to the camp," said Modu Awami, a self-defense fighter who helped question the girl.

She was among thousands held captive for months by the extremists, according to Algoni Lawan, a spokesman for the Ngala local government area that has many residents at the camp and who is privy to information about her interrogation by security forces.

"She confessed to our security operatives that she was worried if she went ahead and carried out the attack that she might kill her own father, who she knew was in the camp," he told the AP on Thursday.

The girl tried to persuade her companions to abandon the mission, he said, "but she said she could not convince the two others to change their minds."

Her story was corroborated when she led soldiers to the unexploded vest, Awami said Thursday, speaking by phone from the refugee camp, which holds 50,000 people who have fled Boko Haram's Islamic uprising.

The girl is in custody and has given officials information about other planned bombings that has helped them increase security at the camp, said Satomi Ahmed, chairman of the Borno State Emergency Management Agency.

The United States on Thursday strongly condemned the bombings. State Department spokesman Mark Toner said the U.S. remains committed to assisting those afflicted by the conflict and supports efforts to provide greater protection for civilians and the regional fight against terrorism.

Boko Haram's 6-year-old Islamic insurgency has killed 20,000 people, made 2.5 million homeless and spread across Nigeria's borders.