(Compass) – Muslim militants have threatened to kill Christian nurses serving at the Federal Medical Center in the town of Keffi , in the central state of Nasarawa, unless they stop conducting Christian worship services. An undated letter received by hospital management and the hospitals chapter of the Fellowship of Christian Nurses (FCN) stated, We are making it abundantly clear that our thirst for your heads/blood is mounting daily if you continue with your worship services in the hospital unabated. Subsequently, the medical director and chief executive at Keffi Federal Medical Center banned Christian-related activities at the facility and banned the FCN chapter indefinitely. How can they ban us from praying or worshipping here, FCN Secretary Christiana Shiaki said, when the Muslims have two mosques built with public funds for them here in the hospital? Violence between Muslims and Christians in central Nigeria over the last three years has left more than 53,000 people dead, most of them Christians.