Around 2:15 p.m. Tuesday, Samuel “Bull” Thomas pushed his older brother in a wheelchair down the first floor of the Bristol Health & Rehab Center. As they rolled down the hallway, the 49-year-old Levittown resident smelled gas.

A thunderous explosion at a Bucks County nursing home collapsed part of the building, sent flames shooting out and left at least two people dead.

Two explosions at the Bristol Health & Rehab Center outside Philadelphia killed at least two people, including nursing assistant Muthoni Nduthu.

A speech therapist working there described feeling the building shake in Tuesday’s blast and hurriedly wheeling out a bed-bound resident, bed and all.

The cause is preliminarily believed to be a natural gas leak, with utility workers at the scene because of a gas odor when the explosion occurred.

Construction crews worked to clear the collapsed walls and roof from a Pennsylvania nursing home Wednesday to help investigators find the cause of an explosion that killed a resident and employee, and set off a dramatic evacuation amid falling debris and shooting flames.

A family of five lost their home and everything they owned in a gas pipe explosion near Hayward last week, family friends told KTVU.

A bomb has exploded during prayers at a mosque in Nigeria's northeastern city of Maiduguri, killing five people. Police describe it as a likely suicide attack.