(CNN) – Nigeria defended its response to the kidnapping of hundreds of schoolgirls by the terror group Boko Haram, even as details emerged Tuesday about a second mass abduction, adding to a growing global outrage over the fate of the children. President Goodluck Jonathan has been under fire over accusations the government initially ignored and then later downplayed the abduction of the girls, who have become the focal point of a social media campaign demanding their safe return.