At 1831 hrs Lewes Fire Dept., was dispatched to a working structure fire on Treadwell Circle. Capt. John Pignataro arrived on scene and reported heavy fire coming from the second floor. An aggressive interior attack was made by the crew on Eng.82-5. Lewes was assisted by the Rehoboth, Indian River and Milton Fire Depts. Crews were on scene for approx 3 hours. The fire is under investigation by the State Fire Marshals office.