Nine seriously injured in Germany bus crash, Australians onboard

Nine people have been seriously injured when a bus with over 30 tourists from Australia, Canada and the US crashed into a truck in Heidelberg, Germany.

Reports suggest 35 people were on the bus and four of them are in critical condition after the vehicle crashed into a truck filled with tyres.

Five rescue helicopters and seven ambulances were called to the scene to treat injured passengers.

The Department of Foreign Affairs and Trade told 9NEWS they are urgently trying to contact local authorities to confirm whether Australians were among the injured.