Philadelphia Building Collapse Leaves 1 Dead, At Least 12 Pulled From Rubble [VIDEO]

A four-story uninhabited building on the corner of 22^nd Street and Market Street in Philadelphia collapsed on Wednesday as it was being demolished, according to reports.

The building collapsed onto a neighboring Salvation Army Thrift Store location, witnesses said.

And while the building is reported to be vacant, there are accounts that eyewitness heard screaming coming from the rubble immediately following the collapse.

"You felt it shake," said Jordan McLaughlin to CNN affiliate station, KYW. "There was people that actually fell over. People started screaming, they ran across the street. There was people inside the building you heard them scream."

There were people in the area that initially thought their city was under attack.

"The first thing that came to my mind was a terrorist attacks," said Kate Slyman, a passerby.

Another witness, Veronica Haynes, was watching the demolition from across the street.

"I was standing there looking out my window, watching the men at work on the building, and the next thing I now I heard something go kaboom," she said. "Then you saw the whole side of the wall fall down... onto the other building."

Rescue crews have been dispatched and are sifting through the rubble for survivors, and conducting a "hands only" investigation at the moment.

Philadelphia police, building inspectors, and other officials from the Occupational Safety and Health Administration confirmed that the collapse was caused by an industrial accident, and that there were "no existing violations" linked to the site.

At least twelve people have been rescued with minor injuries after being trapped for a couple of hours, Mayor Michael Nutter said.

Two people may still be trapped in the building and are the focus of continuing rescue efforts.

"We have located them," said Fire Commissioner Lloyd Aders. "And we're going to continue until we can get them out and we get them to hospitals."

One person has been reported dead, according to MSNBC.

On Feb.1 the city issued a demolition permit for the building, and online records list Plato Marinakos Jr., an architect, as the contractor.

Watch video of the collapse just moments after it happened here: