"The continuing extremist violence in Nigeria is putting pressure on President Goodluck Jonathan to come up with effective policies to control it.
At least 16 people were killed in Nigeria Sunday when a series of bombs went off at a Catholic church service in the northern city of Kano.
The Islamist extremist sect, Boko Haram, is suspected of carrying out the bombings, reported Associated Press.
The Sunday explosions took place at Bayero University near a theater where Catholics were holding a service.
At least three small bombs exploded and when panicked worshippers fled the service they were hit by gunfire, said Abubakar Jibril, a spokesman for Nigeria's national emergency management agency, according to AP.