Radical Islamists are stepping up attacks against Christians in the East African nation of Tanzania.

Nina Shea, with the Hudson Institute's Center for Religious Freedom, wrote in the National Review Online that two Christian leaders have been killed this month.

A group calling itself Muslim Renewal took responsibility for killing a Catholic priest outside his church just before mass.

The group reportedly has ties to the Somalia terrorist group, al Shabab.

They have promised to kill more "infidels" and to burn their homes and churches at Easter time.