Abuja: At least 28 people were killed in wave of explosions, including two suicide attacks targeting churches in Nigeria on Christmas day by a radical Muslim sect in the country's north.

In the first blast, 27 people were killed and many more injured when St Theresa's Church in Madalla near capital Abuja was targeted.

The spokesman for radical sect Boko Haram, Abu Qaqa claimed responsibility for the attacks.

The explosion at St. Thesera's Catholic church occurred after a Mass to celebrate Christmas. The second church bombing took place in central city of Jos, killing one person where constant clashes have taken place between Muslims and Christians.

In Yobe state, the police commissioner, Tanko Lawan said a suicide attacker targeted the headquarters of the oil rich African country’s secret police, State Security Service (SSS).

The explosions followed a slew of strikes by militants, who attacked several northern cities with explosives and gunfire as soldiers and police went in pursuit.

Nearly 70 people have reportedly died in days of fighting between Nigerian forces and Muslim gunmen.

Also on Sunday, police in cities of Damaturu in Yobe state and Maiduguri in Borno state said the number of wounded are still being counted as suicide bombers attacked the two restive cities.

The carnage in Madalla left at least 17 cars damaged by the bomb which killed those who queued up to drive or board commercial vehicles to their homes.

"The owners of these vehicles queued up to drive home after the early morning mass where the message of love, peace and joy was delivered to herald the Feast of Nativity.

Sadly, what we met was this ugly situation," the pastor of the church, Rev. Fr.Isaac Achi said.

One of the victims was found on the roof of the church while several dead bodies were littered in gutters and other parts of the premises.

"The victims have been moved to different hospitals but at St. Lucas hospital, nine of my parishioners were recorded dead.

At Diamond Hospital, a little baby of 5 years who was injured could not locate his parents," Achi said.

Angry youths gathered to protest after the attack but were dispersed by the police.

The explosion in Jos killed a police officer and while three vehicles were destroyed.

"The officers of Search and Rescue Team of NEMA in collaboration with stakeholders have evacuated at least 10 dead bodies from the explosion scene at Madalla to hospitals," spokesman for the National Emergency Management Agency, Yushua Shuaib said.