The explosion occurred during construction work near Donnersbergerbruecke station. Emergency services are on the scene.
Munich police spokesman Peter Werthmann said: “At this point there is no evidence of a crime. According to initial findings we have three people injured, the danger area has largely been cordless and traffic has been cut. trains are congested on the main road”.
Police have yet to confirm what may have caused the explosion.
“There is no danger outside the immediate area,” police said.
This is a breaking news story and will be updated.