Power lines and trees were toppled and hospitals were placed on disaster alert but there were no reports of injuries after a possible tornado hit the city of Elmira Thursday afternoon, Chemung County Office of Fire and Emergency Management spokeswoman Karen Miner said. A state of emergency and curfew were in effect until 8 a.m. in the city, with only emergency vehicles allowed on the streets while fallen trees and power lines were being cleared, Miner said. A shelter was set up at the Elmira Free Academy for residents who didn’t want to stay in homes without power, she said.