"Gunmen kill 15 at college in north Nigeria's Kano"

This attack is deadlier than the Columbine school shooting.  It is deadlier than the Washington Navy Yard or Aurora Movie Theater shootings.  In each of those three attacks, 12 people were killed.  From Reuters:

Gunmen stormed a higher education college in northern Nigeria on Wednesday, firing on fleeing students and setting off an explosion in an attack that killed at least 15 people and wounded 35, police said. . . . "The attackers were wearing suits and were running and shooting everywhere." . . .  At least 82 people were killed in July in a double suicide bombing in the north Nigerian city of Kaduna in July. . . .