Kaduna state spokesman Reuben Buhari asked residents Monday to remain calm and cooperate with security forces.

CNN: STORY HIGHLIGHTS

Kaduna state officials loosened a 24-hour curfew imposed after the attacks, saying people could be on the streets from 2 to 6 p.m.

CNN: STORY HIGHLIGHTS

The third blast, in the northern state of Kaduna, was confirmed by emergency management officials, but no information on casualties or damage was available.

CNN: Bombs target newspapers in Nigeria

Things changed around the year 2000, when Kaduna was hit, for the first time, by religious conflict attributed to the introduction of Islamic law in the state.

BBC: Christian life in northern Nigeria