February 26, 2012 -- Updated 0848 GMT (1648 HKT) An explosive-laden vehicle crashes into a church in Jos It's not immediately clear who is responsible 18 people were killed in a church bombing last Christmas Jos, Nigeria (CNN) -- At least three people were killed Sunday in the latest attack on Christian churches in Nigeria. Police said a car packed with explosives rammed into the compound of the Cocin (Church of Christ) headquarters in Jos, police said. Some church members emerged from the scene covered in dust. It was not immediately clear who was responsible for the attack. Nigeria has suffered a rash of attacks on churches in the past year. In December, Nigerian President Goodluck Jonathan declared a state of emergency in several northern states following a series of Christmas Day attacks on Christian churches. Eighteen people were killed in the bombing of a church in Madalla, according to Nigeria's National Emergency Management Agency. The militant Islamist group Boko Haram has claimed responsibility for that attack.