The emergency shut-down of a reactor in Russia a nuclear power station has caused a wave of panic in the surrounding region.Few details of the incident have been given, officials said there had been a problem in a turbine room but it had not caused a leak of radiation. The Balakovo station is in southern Russian, close to the city of Saratov and about thousand kilometres from Moscow. A security chief in Russia’s federal nuclear authority told Russian TV: “The most important thing was that the reactor’s emergency systems operated as they should have done.” He said it was not an extraordinary incident. But news of the shut-down caused panic in the local community with fears of another Chernobyl disaster. There were reports of people stocking up in iodine and children being sent home from school. A spokeswoman for the environmental group Greenpeace said it was not the first time a reactor at the Balakovo plant had caused a security alert.