A medical supplies warehouse burst into flames , going up in a matter of minutes, as a new video from inside the San Joaquin facility shows just how quickly the situation got out of hand. A video taken by an employee shows a small fire burning and quickly spreading on top of the Medline warehouse’s shelving. It’s unclear what started the fire. The small blaze would go on to rapidly spread across the roof and engulf the entire facility within 30 to 40 minutes, Tracy Fire Chief Randall Bradley