Two passenger trains have collided in the German state of Bavaria, with police saying at least four people have been killed and scores injured, the BBC reports.

The head-on crash happened near Bad Aibling, a spa town about 60km (37 miles) south-east of Munich.

One of the trains was derailed in the crash and several carriages were overturned, German media reported.

Police said rescue teams were trying to free people still trapped in the wreckage.