The suspect appeared to have been fleeing another scene – possibly a knife fight – when he ran into people at the parade, the law enforcement official, who is familiar with the early findings of the investigation, told the BBC’s US partner CBS News.
It is unclear if the individual in custody was the driver of the vehicle.
he had just finished marching in the parade when the SUV “put the pedal to the metal and just [started] zooming full speed along the parade route” at about 16:40 (22:40 GMT) on Sunday.
“Then we heard a loud bang, and just deafening cries and screams from people who are struck by the vehicle,” he said.
Corey Montiho said his daughter’s dance team was hit by the SUV.
“There were pom-poms and shoes and spilled hot chocolate everywhere. I had to go from one crumpled body to the other to find my daughter,” he told the paper.
Sarah Saldivar, who was at the parade with her two young children, told CBS News she saw “a red blur” and then saw “little girls flying through the air.