SAO PAULO – A motorist has run his car through a crowd of about 100 pro-bicycle activists in southern Brazil, hitting and injuring at least 16. Police in the city of Porto Allegre say the man is being questioned.

Video of the incident shows bicycles and riders flying through the air as fellow cyclists scream in panic. None were killed.

Police have not released the driver's name.

Cyclists in the Critical Mass ride tell the Folha de S. Paulo newspaper that the man argued with some riders, who had taken over all lanes of the street on Friday.

The video shows the car accelerating through the pack of riders, leaving the injured on the street screaming as fellow cyclists administered first aid.