Denver Police have asked the public to be on the lookout for a white Chevrolet truck after they say the truck collided with a motorcyclist on Federal Blvd. and drove off just before the Friday afternoon rush hour.

Police tweeted around 3:30 p.m. that a motorcyclist had been seriously injured on Federal Blvd. at Iowa Avenue by a hit-and-run driver.

Southbound lanes of Federal were shut down, police said.

Ten minutes after their first tweet, police announced they were looking for a white Chevrolet truck with the possible partial license plate number starting with "524N."

Police asked the public to call 911 if the van was spotted.