Investigators believe a transient trying to keep warm started a fire in a vacant warehouse adjacent to the Rio Grande Station Saturday, causing an undetermined amount of damage.

The blaze spread to some debris on a loading dock, and then to a warehouse doorway, said Tom Tallon, Salt Lake fire battalion chief.Two fire engines and one truck responded to the scene of the blaze, about 8:15 p.m., which the 14 firefighters easily extinguished, Tallon said.

No injuries were reported.