A German charity has accused the Libyan coast guard of threatening its crew members who were rescuing migrants in the Mediterranean Sea, causing at least one migrant to drown. The German charity SOS Humanity, which operates the rescue ship Humanity 1, said the Libyan coast guard used violence and fired live bullets into the water during its "life-threatening intervention" on Saturday. A spokesman for the Libyan coast guard didn't respond to phone calls and messages seeking comment. As part of the deal, the coast guard has intercepted migrants in Libyan and international waters and has returned them to Libya. In March last year, the Libyan coast guard fired warning shots as it attempted to rescue migrants from a packed ship, according to the SOS Mediterranee group, which also rescues migrants at sea.