JOS, Nigeria—A spectacular prison break on Nov. 26 in Jos, Nigeria has embarrassed authorities and sparked fears of a terrorist crime spree in Africa’s most populous nation. At least 252 inmates escaped after a black-clad, six-man team dropped from a speeding van at 5:20 p.m. and blasted through a gate lock with bullets and overpowered guards, according to a prison staff member who asked for anonymity. The invaders killed a prison assistant superintendent near the gate and gained access to the guards’ gun locker, where they grabbed rifles that they handed to a group of inmates. “They first killed one member of our armed squad, Assistant Superintendent of Corrections (ASC) Umar A. Mohammed,” said a staffer to The Epoch Times. “Another Officer on duty with Umar was also injured but he survived,” the source said. In the space of a few minutes 260 men streamed out of the prison gate …