NEW : In a video , the group claims responsibility for a kidnapping at a bus station . NEW : But the leader of the group says nothing about its kidnapping of the girls . Government : `` This is a prelude , '' said the man , who wore camouflage and held an AK-47 assault rifle , in the video . 45 school girls are free , the fate of the rest is unknown . The abduction is being blamed on the Islamist militant group Abu Haram .
NEW : In a video , the group claims responsibility for a kidnapping at a bus station . NEW : But the leader of the group says nothing about its kidnapping of the girls . Government : 45 school girls are free , the fate of the rest is unknown . The abduction is being blamed on the Islamist militant group Abu Haram .