By Emma Lacey-Bordeaux
updated 2:47 PM EDT, Sun September 29, 2013
-- Under the cover of darkness, gunmen approached a college dormitory in a rural Nigerian town and opened fire on students who were sleeping.
At least 21 died, according to Nigerian President Goodluck Jonathan.
The gunmen fired indiscriminately on the male dorm, said Lazarus Eli, a military spokesman. The attack took place at about 1 a.m. Sunday at the College of Agriculture Gujba.
"So far all evidence points to the Boko Haram," Eli told CNN by phone.
Since 2009, Boko Haram has sown murder and mayhem in Nigeria's northeastern region.
The Islamic militant group's name translates from the local Hausa language as "Western education is a sin."