A man is in police custody after authorities said he drove an SUV into a crowd of Christmas shoppers in Melbourne, Australia.

Victoria police called the attack a "deliberate act," but authorities were unsure of the motive.

The attack happened around 4:30 p.m. local time outside the Flinders Street station, CNN reported.

Flinders Street is one of the city’s busiest pedestrian roads. It connects a train station with the city center and was crowded as commuters traveled to and from work and as shoppers finished their Christmas shopping.

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Waymo autonomous vehicles operate across 65 square miles inside I-285 and have been involved in six incidents with Atlanta Public School buses since May. Waymo issued a recall because of their cars briefly stopping or slowing down before continuing forward while a bus was stopped and flashing its lights. (Courtesy of Atlanta Public Schools)

Credit: Courtesy of Atlanta Public Schools