Two commuter trains crashed head-on Tuesday morning in a remote area in southern Germany, killing at least nine people and injuring some 150, some of whom had to be cut out of the wreckage and transported across a river for medical care, police said.

The two regional trains crashed before 7 a.m. on the single line that runs near Bad Aibling, in Bavaria, and that several wagons overturned, police spokesman Stefan Sonntag told The Associated Press. Fifty of those hurt have serious injuries, he added.

It took hours to reach some of the injured in the wreckage and authorities were still working at midday to remove the final body from the train.

The rail line is commonly used by commuters heading to work in Munich, and would normally also carry children traveling to school, but they are currently on holiday, the DPA reported.

It was not clear how fast the trains were traveling at the time of the crash but German rail operator Deutsche Bahn said they were permitted to travel of speeds up to 120 kilometers per hour (80mph) on that stretch of track.

The trains crashed in a remote area about 60 kilometers (40 miles) southeast of Munich in an area with a forest on one side and a river on the other. Rescue crews using helicopters and small boats shuttled injured passengers to the other side of the Mangfall river to waiting ambulances. Authorities said they were being taken to hospitals across southern Bavaria.

The two trains from the so-called Meridian line were both partially derailed and wedged against one another, train operator Bayerische Oberlandbahn said in a statement on its website.

It was not yet clear what caused the crash, police said.

Germany is known for the quality of its train service but the country has seen several other accidents, typically at road crossings.

Most recently, a train driver and one passenger were killed when a train hit the trailer of a tractor in western Germany in May, injuring another 20.

Germany's worst train accident happened in 1998, when a high-speed ICE train crashed in the northern German town of Eschede, killing 101 people and injuring more than 80.