On that Christmas Day, Some set of attacks occurred during Christmas Day church services in northern Nigeria on 25 December 2011. Where There were bomb blasts and shootings at targeted churches in Madalla, Jos, Gadaka, and Damaturu. A total of 41 people were reported dead.
The Attacks:

Madalla

The attack On the St. Theresa Catholic Church in Madalla during the Christmas Day service was Devastating, At least 37 people died and 57 others were injured in the attack during the time of worship and celebration, a satellite town of Abuja located 40 km (25 mi) from the city center.
A local coordinator with the National Emergency Management Agency (NEMA) confirmed the death toll. NEMA spokesperson Yushau Shuaibu said that the Madalla explosion took place on the street outside the church. He included that the church, which had a capacity to accommodate 1,000 people, was badly affected by the blast.
Witnesses said that the impact of the explosion shattered windows of nearby houses. Officials at the local hospital said that many injured individuals were in serious condition. Again, Slaku Luguard, a NEMA coordinator, said that rescue workers, facing challenges due to the scale of incident, discovered at least 25 bodies and The wounded were disturbed to various Hospitals. NEMA acknowledged that it did not have enough ambulances to help the wounded.
Luguard also said that an angry crowd, which gathered at the blast site, blocked emergency workers from getting inside: “We’re trying to calm the situation. There are some angry people around trying to cause problems,” he said.
Jos Attack:

The Mountain Of Fire and Miracles Church in Jos Also Experienced An Explosion and subsequently gunmen Open fire later on police who were guarding the area, Tragically resulting to the death of one police officer.
Additionally, authorities discovered Another two bombs in a nearby building and They were successfully disarmed.
Gadaka And Damaturu:

The City Of Damaturu Experienced Two explosions with one of them involving a car suicide Bomber which was targeted On The Headquarters of the State Security Service On that Christmas Day, Another Explosion occurred at a church in the northeastern town of Gadaka.