Seven people have been killed and 24 injured in a large explosion outside a Christian church in Egypt's northern city of Alexandria while at least 30 people were killed when a bomb went off at a market near a military barracks in Abuja in Nigeria on New Year's Eve.Egypt's interior ministry said the wounded included eight Muslims. Preliminary investigation indicates a car was the reason behind the explosion. It was parked in front of the church and had been assumed to belong to one of the people who often come to the church. A security source in the port city of Alexandria said there had been a blast outside a church at about midnight (local time). Muslim majority Egypt has a large Christian minority, making up about 10 per cent of the nation's 79 million. In recent months there have been clashes centred on religious differences. In Nigeria, State-run TV channel reported about two more explosions in the city. The second one was said to have exploded at a road leading to the Nnamdi Azikiwe International Airport while the third one was said to have went off at a Church in an area called Nyanya. But casualty figures for the two are yet to be known.The police and emergency service workers could not be reached for comment on the bombing and casualty figures but a top Air Force official confirmed the bombing at a beer drinking spot near the Sani Abacha Barracks.