Deadly Elizabeth house explosion: Youngest of 15 hurt is 10 months old

One person is dead, 15 people hurt and one unaccounted for following Wednesday morning's house explosion in Elizabeth.

ABC 7 reports the most seriously injured person is a 19-year-old woman, while the other injured victims range in age from 10 months to age 50. No names have yet been disclosed by police.

"That was the biggest, loudest boom I've ever heard," tweeted witness @lulune6C of the explosion that obliterated the second floor of a two-story duplex on Magnolia Street.  "I ran out of my house when I heard it. Elizabeth mayor Chris Bollwage said at a press conference that the explosion flattened the home "like a pancake" and also destroyed the homes on either side. Five other homes were damaged by the blast. ABC 7 reports the homes were all recently constructed.

Bollwage said he is "90 percent sure" the explosion was the result of a natural gas explosion. Elizabethtown Gas spokesman Duane Bourne said a preliminary investigation hasn't linked the explosion to a natural gas leak, but the investigation is ongoing.

Red Cross of North Jersey tweeted it is assisting families affected by the explosion.

The Associated Press contributed to this report