Bergen County, N.J. ? Authorities who searched the rubble of a deadly apartment-complex explosion overnight for four missing tenants found them Wednesday, going about their normal business.

“They didn’t even know they were missing,” Bergenfield Mayor Richard Bohan said. “Apparently they were going about their normal daily routines and it never occurred that someone might be looking for them.”

Tuesday morning’s explosion and fire, which obliterated much of the complex, killed three people and injured five, occurred after construction workers hit a gas line, authorities said.

Search teams using dogs had scoured the ice-encrusted rubble of the building overnight but failed to find additional victims.

The dead had not been identified Wednesday. Family members waiting for word on their loved ones were asked to gather dental records.