Investigators sift through wreckage after fatal nursing home explosion in US

Investigators work around Bristol Health & Rehab Centre and surrounding rubble after a gas explosion the day before in Bristol, Pennsylvania, US (Mingson Lau/AP)

Construction crews have been working to clear the rubble of a Pennsylvania nursing home, a day after a powerful explosion killed two people at the building in the US state.

Searchers have accounted for everyone who was thought to be missing, Bristol police chief Charles Winik said.