Hagerstown fire fighters were busy with two building fires on Thursday evening.

Units were called to 21 West Antietam Street for a structure fire at around 10:57 PM. They found flames coming from the back of the fourth and fifth floors. Fire fighters tried an interior attack, but the fire had spread into the walls and void spaces. So they switched to a defensive aerial attack.

A half hour later, a second alarm was sounded.

The fire was contained to the building, which was not occupied. But there was significant damage to the upper floors and roof.

Fire fighters entered the building at 8:30 Friday morning to extinguish hot spots so that fire marshals could begin an investigation. No one was injured.

66 units responded to that fire. The last ones  cleared by 2:25 PM on Friday.

The Hagerstown Fire Marshal's Office is asking anyone who may have noticed activity around the building to call 301-790-2476.

The second fire also occurred at 10:57 PM at a home at 237 Winter Street. The remaining fire stations and personnel responded and extinguished the blaze, which was contained to the bedroom. But there was smoke damage all over the home.

No one was hurt, but a family pet perished.

Units cleared  at 12:45 AM, Friday.

That fire is also under investigation.