NEW : The 25 people killed include 22 students , a police official says . NEW : ` ` We believe this was an inside job , '' the official says . An attack that killed 25 people , mostly students , at a Nigerian school Monday night appeared to be `` an inside job '' in which the gunmen called out the names of their targets , a police spokesman told CNN Tuesday . `` The attackers went to the houses of the victims , called them out by their names and killed them , '' Adamawa State Police spokesman Mohammed Ibrahim said . ' Attackers called victims out by their names and killed them , '' he says . The attack happened at a university in Mubi , Nigeria .
NEW : The 25 people killed include 22 students , a police official says . NEW : ` ` We believe this was an inside job , '' the official says . ' Attackers called victims out by their names and killed them , '' he says . The attack happened at a university in Mubi , Nigeria .