With bright lights to show the way, rescuers worked through the night searching for missing people in the rubble of two buildings that collapsed after an explosion in east Harlem.
Just after midnight, crews found a fourth body in the rubble.
The victims are being identified. One is 44-year-old Griselde Camacho - a single mom to a teenage boy and a security officer at Hunter College.
Another - 67-year-old Carmen Tanco - a dental hygienist who had Wednesdays off. Relatives were hopeful until the last minute.
"My family has been trying to call her all day long just hoping that maybe she's in the neighborhood just doing something, running errands or something," says Lucina Ortiz, Tanco's niece.
People in this neighborhood say they had complained of an unbearable gas smell for weeks. Utility crews were on their way to investigate when the explosion occurred.
Cell phone video shows the chaotic moments immediately after a gas leak triggered Wednesday mornings' blast. Huge flames lept into the sky.
"It sounded like a bomb," says one witness.
A Google image shows what the two five story buildings looked like before and..is what's left.
The National Transportation Safety Board is on the scene to find out what caused the leak and explosion. In addition to investigating transportation issues, the agency is also responsible for investigating pipeline incidents.
(Marlie Hall, CBS News)
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