Around 10:20am today, Stepney, Stevenson, and Monroe fire departments were dispatched to a report of smoke in a house on Hattertown Rd. On arrival, the first arriving unit reported a 2 1/2 story wood frame with heavy smoke showing, upgrading the assignment to a working structure fire. Companies encountered heavy fire on all 3 floors of the house. A brief mayday occurred during the incident in which one firefighter was minorly injured due to a stair-step collapse. All companies were pulled from the structure and began a defensive attack. Companies worked for an hour and a half before the fire was declared knocked at 12:19pm. The Monroe Fire Marshal's office and the State Fire Marshal's office are working to determine the cause of the fire