All rail cars, including those carrying liquified petroleum gas, after been removed from the Willimantic River, just a day after a train derailment in Mansfield, the Department Emergency Management and Homeland Security said. All of the cars are now uprighted on land, officials say. A shelter in place remains in effect Friday. Route 32 also remains closed. Mansfield officials advise residents keep windows shut as a precaution. Mansfield Fire Chief John Roache said Friday that the cleanup effort will slowed by cold weather and snow, but warming tents have been set up for workers. Roache reiterated that officials are still monitoring the scene, and are still not picking up any signs of any flammable gases or leaks from the train cars. Around 9 a.m., Thursday, 13 cars from 43-car train detailed near Route 32 in Mansfield. The train was carrying grease and liquid propane, and four propane tank cars went into the river. One worker suffered a minor head injury after slipping and falling, officials said. Roache said people should continue to avoid the area because of increased traffic from cleanup operations. Officials said rail shipments are not impacted because trains can be rerouted. The cause of the derailment has not been determined.