“We have been in contact with Nigerian officials about what appear to be terrorist acts and pledge to assist them in bringing those responsible to justice,” White House Press Secretary Jay Carney said in a statement. “We condemn this senseless violence and tragic loss of life on Christmas Day.”
The death toll in the most deadly of the attacks—a bombing of a church in the capital, Abuja—has risen to 35, with another 52 wounded, the Associated Press reports. More than 40 are dead in all.
The violence has left worshippers fearful of further attacks. This is the second Christmas in a row that the radical, anti-Western Muslim sect Boko Haram has been blamed for deadly attacks on the Christian holiday. Last year, 32 were killed on Christmas Eve.