After the Munich commuter train accident in Upper Bavaria, police are investigating the cause of the accident. The two trains of the S7 line collided on a single-track line, the chief spokesman of the Munich police told dpa. In addition to the state police, the federal police and specialists from rail operator Deutsche Bahn were also at the scene. Exactly how the accident happened on Monday afternoon is under investigation, the spokesman said. One passenger died, at least a dozen people were injured.