Suspected Boko Haram militant gunmen in Nigeria fatally shot five Christian worshipers who were praying, police said. The shooting happened in the city of Potiskum at about 2:00 a.m. on Tuesday, Xinhua reported. \"They opened fire on the worshipers while praying and observing the Christmas celebration at about 2 a.m. local time on Tuesday, \" a security official said. \"Five of the worshipers died and some were injured. The gunmen also burnt down the church after the killing,\" Barnabas Musa, a Potiskum resident who also lost a relative in the attack. The pastor of the church was among those killed, Musa said. No arrests have been made; police are investigating the incident.