[DAWN] Nigeria on Saturday marked four years since Boko Haram abducted more than 200 schoolgirls from the remote town of Chibok, with renewed calls for their release and that of thousands of others seized in the bloody conflict.A total of 219 girls were taken from the Government Girls Secondary School in the remote town in Borno state on the evening of April 14, 2014, and have become an enduring symbol of the Islamist insurgency.
Four years on, 112 are still being held.