Des Moines fire crews are investigating the cause of a fire at a laundromat Tuesday morning.

It happened at the Coin Laundry in the 2300 block of East University Avenue at about 9 a.m.

Fire crews told KCCI the sprinkler system did its job in suppressing the fire. They believe it may have started in a dryer vent.

There were no injuries reported in the fire. Traffic in one westbound lane of East University Avenue was closed so crews could work at the scene.