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

However, elections for powerful state governors will be delayed for two days, until Thursday, in two of the worst affected states - Kaduna and Bauchi, the electoral commission announced.

BBC: Nigeria unrest 'recalls lead-up to 1967 Biafra war'

If it had been available when the Kaduna river burst its banks last week, driving 5, 000 people from their homes, the government could swiftly have identified the worst-affected areas.

ECONOMIST: A boon or a boondoggle?

One, run by a pastor and an imam who once tried to kill each other but have since become friends, has calmed a little the troubled city of Kaduna.

ECONOMIST: They are not ethnic, nor are they religious

"There is no Nigerian soldier that goes out on the streets to just kill innocent Nigerians, " Col Sani Kukasheka Usman told the BBC at the First Division headquarters in Kaduna.

BBC: Nigerians' fear of northern atrocities

The source, who lives at the family home in Kaduna in northern Nigeria, said the son informed his family in the text message that he was leaving school in Dubai to move to Yemen.

CNN: Obama orders review of flight screenings

The military statement said Mr Zangina was leader of Boko Haram in the "North Central part of Nigeria and co-ordinator of most of the suicide attacks and bombings in Abuja, Kaduna, Kano, Jos and Potiskum".

BBC: Nigeria 'arrests Boko Haram militant'