Fire investigators have ruled the first of two firesGreenspring Avenue 3-alarm fire, November 22-23. at a large, two-story Greenspring Avenue home last week accidental, caused when sparks rising out of a fireplace and chimney ignited the roof. The cause of second fire -- a three-alarm blaze that destroyed the home -- will remain undetermined because the damage is so extensive that investigators cannot pinpoint the origin.

Investigators said suspicious activity is not a factor in either fire.

Fire crews were dispatched to the 10700 block of Greenspring Ave., 21093, at 1:52 p.m. on Thanksgiving Greenspring Avenue 3-alarm fire, November 22-23Day for a dwelling fire.

BCoPD investigators said the family was at home, having a Thanksgiving gathering, when one of the children playing outside saw fire on the roof. The occupants self-evacuated, and firefighters contained the fire by 2:49 p.m. Fire damage largely was contained to the roof and an upstairs bedroom.

Fire crews were dispatched to the same Greenspring Valley address at 3:32 a.m. Friday. Commanders reported fire through the roof at 3:53 a.m. and called for a second alarm. The fire spread quickly, and several large-capacity tankers were deployed to try to contain it. Commanders requested a third alarm at 4:22. At one point, all fire personnel were ordered to evacuate the structure because of the threat of building collapse. A partial collapse occurred at 5:03 a.m.

No injuries were reported. Investigators said that, because of water and fire damage to the main house from the first fire, the family spent the night in an adjacent pool house. The child who told his parents about the first fire also saw the second fire and alerted the family. All occupants got out on their own.

More than 40 pieces of fire equipment were required to fight the three-alarm fire.