India, Dec. 24 -- Multiple people are believed to be trapped inside the Silver Lake Nursing Home in Bristol, Bucks County, Pennsylvania, following an apparent gas explosion that caused a partial building collapse. The incident occurred around 2:15 p.m. Tuesday at the facility in the 900 block of Tower Road in Bristol Township.

Upper Makefield Township police have classified the situation as a mass casualty incident, though officials have not yet released details on the number or condition of any victims.

Videos circulating on social media show extensive structural damage to the nursing home, along with visible fire and heavy smoke.

Authorities are urging the public to avoid the area as a two-alarm fire response remains active and firef...