(CNN) - Ten people are dead and 15 are injured after the driver of a van plowed into multiple pedestrians in Toronto on Monday in what appears to be a deliberate act, Toronto Police Chief Mark Saunders said.

Saunders said the suspected driver, Alek Minassian, 25, of Richmond Hill, Ontario, was in custody. Minassian was arrested in a white rental van less than 30 minutes after police received a 911 call, Saunders said.