A car drove into a union demonstration in central Munich injuring at least 28 people including children, authorities said.

Bavarian governor Markus Soder said the incident on Thursday was “suspected to be an attack”.

Police said a car drove into the back of a demonstration by the service workers’ union ver.di that was taking place in a square near downtown Munich around 10.30am.

Emergency services attend the scene of an accident after a car hit a group of people in Munich, Germany (Christoph Trost/dpa via AP)

A damaged Mini could be seen at the scene, along with debris including shoes.

Police said at least 28 people were injured and the suspect is believed to be a 24-year-old Afghan asylum-seeker.

The Bavarian capital will see heavy security in the coming days because the three-day Munich Security Conference, an annual gathering of international foreign and security policy officials, opens on Friday.