Islamic terrorist group Boko Haram launched a major offensive against churches in northern Nigeria Sunday, leaving dozens dead and injured.

Witnesses say the terrorists descended during worship services and set fire to church buildings with Christians inside.  When the Christians attempted to flee the flames, the terrorists would gun them down with automatic weapons.

A vigilante group in the village of Kwada said that at least 30 victims have been confirmed dead and the death toll was likely to rise significantly because a number of people fled into the bush and were chased by armed terrorists.

At least four churches were burned to the ground during the assault, including one church that was started by American missionaries in the 1920s.  In addition to the churches, the terrorists set fire to the homes of Christians in at least two communities.

Officials say the terrorists also attacked the village of Kautikari to continue their assault but they have not been able to get a count of the dead and wounded.