Eleven railway tank cars carrying gas derailed in the Russian city of Perm, with one of them overturning, but no injuries have been reported, UPI quoted authorities as saying. Rail traffic was suspended in both directions on the line following the accident at the Osentsy rail station that occurred Thursday at 11:26 a.m., ITAR-Tass reported. Authorities said no buildings were damaged and there was no threat to the environment. Cleanup efforts were under way and an investigation into the cause of the accident was in progress, ITAR-Tass said.