Police used water cannons to disperse about 300 protesters hurling rocks and fireworks during an attempt to disrupt a shipment of nuclear waste in northern Germany on Saturday, AP quoted officials as saying. Another 50 activists tried to sabotage the rail tracks that will be used by a train this weekend to transport the nuclear waste to the storage facility near the northern town of Gorleben, police spokesman Stefan Kuehm-Stoltz said. Police said several thousand protesters were gathering in Dannenberg Saturday to hold a peaceful protest rally. Organizers said some 23,000 people already joined the protest.