Police say witnesses had reported seeing a man run from the vehicle. They also reported that that there was a strong smell of gasoline in the area.
The truck was described as a U-Haul or Ryder truck. Investigators x-rayed the truck and cut a hole into the side. It was found empty. Traffic on the Robert F. Kennedy Bridge resumed around midnight.
Investigators are now trying to find the man who abandoned the truck.
The Associated Press contributed to this report