Investigators Probe Deadly Long Island House Explosion

Investigators are sifting through the debris of a house destroyed in an apparent gas-related explosion that killed a toddler and injured 17 others.

Authorities returned to the scene on Wednesday in the middle class neighborhood of Brentwood.

Fire Department Inspector Robert Kuehn said the initial investigation indicated the blast "could be gas-related." A police official said there were two, 200-pound propane gas tanks on the premises, but that no natural gas lines were present on the block.

The entire structure was reduced on Tuesday to small shards of wood, plywood, drywall, insulation and other materials. The air conditioners in one neighbor's home were blown out and a window was knocked out of its casing.

The 18-month-old boy's parents were among those injured.