"Let me be clear. The kidnapping of hundreds of children by Boko Haram is an unconscionable crime," Kerry said in a policy speech in the Ethiopian capital Addis Ababa.
"We will do everything possible to support the Nigerian government to return these young women to their homes and hold the perpetrators to justice. That is our responsibility and the world's responsibility," he said.
The US, he added, was "working to strengthen Nigeria's institutions and its military to combat Boko Haram's campaign of terror and violence".
Nigerian police yesterday said Boko Haram militants were holding 223 girls of the 276 seized from the school, revising upwards the number of youngsters abducted.
The girls' abduction has triggered global outrage and prompted protests in a number of Nigerian cities, as desperate parents call on the government to secure their release.
Nigerian mothers today vowed to hold more protests to push a greater rescue effort from authorities.
She said that women and mothers will on Tuesday march to the offices of the defence minister and chief of defence staff "to ask them what they are doing to rescue our daughters".
"We believe there is little or no effort for now on the part of the military and government to rescue these abducted girls, who are languishing in some dingy forest," she said.
Nigeria's information minister, Labaran Maku, said yesterday that President Goodluck Jonathan had chaired a top-level meeting with military and security chiefs about a possible rescue mission.
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