Updated

A passenger train in Switzerland has derailed in what police are calling a “serious accident,” as several cars are hanging over a steep wooded area.

The train was traveling from St. Moritz to Chur in eastern Switzerland and was derailed by a landslide, police told SWI.

At least three cars derailed and one carriage slid off the tracks onto a steep slope, police said.

Five people were seriously injured and another six sustained slight injuries, said Anita Senti, a police spokeswoman for Switzerland's southeastern Graubuenden state.

Some of the passengers were rescued by helicopter. An air rescue service was helping the recovery effort at the site, which wasn't close to a road.

Some 200 people were on board the train at the time of the accident, which followed heavy rain in the region. The train is operated by Rhaetische Bahn, which runs a network of narrow-gauge routes in Switzerland's mountainous southeastern corner.

An eyewitness who spoke to Swiss website Blick.ch said there was an announcement for passengers to move to the rear of the train after the derailment.

"We had to walk about a kilometer... through a tunnel. The luggage is still on the train," the witness said, according to Sky News.

The accident comes two days after three people died in a minibus-train collision in Switzerland, the BBC reports.

The Associated Press contributed to this report.