PHILADELPHIA—Tens of thousands of horn-honking, high-fiving Phillies fans streamed into the streets Wednesday night after Philadelphia won the World Series, celebrating the championship by knocking down traffic signals, spraying beer and shooting off fireworks.

Fans raced through downtown on their way to Broad Street, the city’s main thoroughfare, yelling and waving from open sunroofs, windows and jam-packed pickup truck beds.

Scattered vandalism was reported as revelry continued into the early morning Thursday before police began breaking up the thinning crowds.