A trailer used as an office by Metro maintenance workers caught fire in Camp Springs Thursday afternoon.

Prince George's County firefighters arrived at the trailer, near the tracks outside the Branch Ave Metro station, around 12:15 p.m. and took 15 minutes to extinguish it.

No one was in the trailer, fire department spokesman Mark Brady said.

Officials said they were investigating the cause of the fire and estimated the damage would cost about $25,000.