HAMBURG (REUTER) - Suspected anti-nuclear activists smashed the windows of three public buildings overnight, police said on Tuesday. Hamburg police said the protestors damaged an electricity works building, a bank and a German railways building. They said they had found leaflets criticising the transport of nuclear waste at the three sites. On Saturday about 1,500 activists in northern Germany demonstrated against shipments of nuclear waste to a nearby medium-term storage depot at Gorleben. Police said protesters had walked along a quiet stretch of railway line on Saturday and sawed away pieces of the tracks and their foundations. It was not clear much damage had been done. New fears about nuclear shipments were sparked nearly two weeks ago when a train carrying nuclear waste through eastern France was derailed, though officials said there was no radiation leak. The medium-term nuclear waste storage depot and planned long-term dump at Gorleben is a favourite target of the anti-nuclear movement and last year more than 19,000 police and border guards were called in to ensure a shipment reached the plant safely. Protests are mounting again because another shipment is due to arrive at Gorleben next month.