Philadelphia Building Collapse: Up To 10 People May Be Trapped In Center City, Says Fire Official [VIDEO]

UPDATE: 13 people have been hurt and taken to hospitals with minor injuries, and a 35-year-old woman was killed by the collapse. The building that collapsed was behind a Salvation Army Thrift Shop and it was scheduled to be demolished. Roofers Patrick Glynn, a witness, said he had been watching workers take down the building next to the Salvation Army building over the past few weeks, and said he suspected a collapse was inevitable because of the methods the workers were using to tear it down.

"For weeks they've been standing on the edge, knocking bricks off," he said. "You could just see it was ready to go at any time. I knew it was going to happen."

A building collapsed at the corner of 22^nd and Market streets in Center City, Philadelphia this morning, leaving at least five injured. Reports say that at least 12 people have been rescued already and there might be 8 to 10 people still trapped in the rubble.

"We're trying to locate voids and areas where we can hopefully access those people and get them to medical attention right away," said Philadelphia Fire Commissioner Lloyd Ayers.

Two of the victims were already taken to Hahnemann University Hospital and three others were transported to the Hospital of the University of Pennsylvania. All victims are reportedly adults and there is no word on the severity of their injuries.

It is not clear how the four story building collapsed, but police are asking the public to stay out of the area to allow access to rescue workers. There have been reports saying that an explosion may have caused the collapse, but authorities are currently saying that is unlikely.

Yahoo! Sports columnist Les Carpenter was in the area at the time of the collapse, and kept his followers updated with his tweets. He said at first police thought it was an explosion and they were worried about another one but he couldn't understand why because he did not hear a boom in the first place. Carpenter later spoke to Philly Police Chief Ramsey, who denied the explosion rumors.

This is a breaking news story. Check back for updates.