Courtesy photo A Hudson police officer assists a woman who is believed to be a resident of the Hudson home that was heavily damaged by a 2-alarm fire Saturday evening. The house, at 22 Boyd Road, went up in flames again early Sunday morning and was destroyed. (Courtesy photo)

HUDSON — The four occupants of a split-level home at 22 Boyd Road managed to escape relatively unscathed from a fast-moving fire that broke out in the residence shortly after 5 p.m. Saturday, officials said.

While three of the four were treated for what officials called mild smoke inhalation and transported to a local hospital for observation, none suffered serious injuries.

The occupants include the homeowners, Norma and Wilmot Dennis, and two others who are believed to be family members.

The fire and smoke damage rendered the house inhabitable, officials said — which actually turned out to be a blessing because about 12 hours after the blaze was brought under control, the house went up in flames, causing damage so extensive that a town public works crew was called in with an excavator to demolish, for safety purposes, what was left of the house.

While fire department Captain Kevin Blinn, the incident commander on duty for both fires, provided additional details of the first one through a press statement, neither local nor state investigators returned calls or emails Sunday requesting an update on the circumstances surrounding the second fire.

Courtesy photo The second of two fires to strike a Boyd Road residence in Hudson over the weekend engulfs a vehicle parked in the driveway as the house itself goes up in flames. (Courtesy photo)

In all, five engines, two ladder trucks, three tankers and two ambulances were called to the scene for the first fire. Crews from Nashua, Londonderry and Pelham joined Hudson Engines 1, 2 and 4 and Ladder 2 along with the command staff, on the initial call.

The crew of first-due Engine 1 had knocked down the bulk of the heaviest fire by the time the others arrived.

Crews from many of the same towns returned to Hudson for the second blaze. Hudson Engine 1 was again the first on the scene, and upon arrival reported the house fully involved with fire.

Dean Shalhoup may be reached at 594-1256 or dshalhoup@nashuatelegraph.com.

Courtesy photo First-arriving firefighters were greeted with heavy flames and smoke coming from the residence at 22 Boyd Road Saturday evening. Crews were called around 6 p.m. to the fire, and were called back 12 hours later to find the entire house engulfed in flames. (Courtesy photo)

Courtesy photo Firefighters and department officials from Hudson and neighboring towns gather in the front yard of 22 Boyd Road after bringing Saturday's 2-alarm fire under control. A second fire that broke out about 12 hours later engulfed the entire home and reduced it to rubble. (Courtesy photo)

Courtesy photo Firefighters and department officials from Hudson and neighboring towns gather in the front yard of 22 Boyd Road after bringing Saturday's 2-alarm fire under control. A second fire that broke out about 12 hours later engulfed the entire home and reduced it to rubble. (Courtesy photo)

Courtesy photo The second fire to strike a home at 22 Boyd Road within 12 hours had engufled the entire building when firefighters arrived around dawn Sunday. State and local fire officials are investigating. (Courtesy photo)