Watch CBSN Live

At least 6 crushed to death in Florida bridge collapse

MIAMI -- Police say the death toll in the collapse of a pedestrian bridge being built here had risen to six -- and there could be more bodies in the rubble. During a news conference Friday morning, authorities confirmed one of the victims killed in the bridge collapse was a Florida International University (FIU) student. The victim's identity is being withheld pending family notification. 

"The primary focus is to remove all cars and all victims in a dignified manner, and not compromise the investigation in the process," Maurice Kemp, deputy mayor of Miami-Dade County, said during the news conference. "The investigation is vital because we want to ensure that this accident doesn't happen again locally or anywhere else in this country."

"This is a tragedy that we do not want to reoccur anywhere in the U.S.," Miami-Dade County Police Department Director Juan Perez added.  

Perez said the department's homicide division is conducting the investigation. However, no criminal charges are pending at this time. A team of state attorneys was sent to the scene to assist with the investigation.

"This has turned into from a rescue to a recovery operation," said Detective Alvaro Zabaleta, a public information officer for the Miami Dade Police Department.

Miami-Dade County Fire Chief Dave Downey had said Thursday night his crew was still using high-tech listening devices, trained sniffing dogs and search cameras in a race to find anyone still alive.

In addition to the six people who were killed, at least nine others were injured and taken to local hospitals; officials at one point said 10 were injured.  

As Florida authorities work to identify the people who died in Thursday's catastrophic collapse, state and federal investigators will begin the task of figuring out how and why the five-day-old span failed.   

The $14.2 million pedestrian bridge was supposed to open in 2019 as a safe way for students to cross the busy road beneath. It linked the community of Sweetwater with the campus of Florida International University.

Florida Gov. Rick Scott and U.S. Sen. Marco Rubio attended an evening briefing.

Rubio said the public and the families of the dead and injured deserve to know "what went wrong."

Scott added that an investigation will get to the bottom of "why this happened and what happened." He said if anyone did anything wrong, "we will hold them accountable."

The National Transportation Safety Board is on-scene:

Rubio, who is an adjunct professor at the school, noted the pedestrian bridge was intended to be an innovative and "one-of-a-kind engineering design."

An accelerated construction method was supposed to reduce risks to workers and pedestrians and minimize traffic disruption, the university said. The school has long been interested in this kind of bridge design; in 2010, it opened "The ABC (accelerated bridge construction) Center," to help bridge professionals. Other universities around the country partnered with FIU to "provide the transportation industry with the tools needed to effectively and economically utilize the principles of ABC to enhance mobility and safety, and produce safe, environmentally friendly, long-lasting bridges."

Renderings showed a tall, off-center tower with cables attached to the walkway to support it. When the bridge collapsed, the main tower had not yet been installed, and it was unclear what the builders were using as temporary supports.

The project was a collaboration between MCM Construction, a Miami-based contractor, and Figg Bridge Design, based in Tallahassee. Figg is responsible for the iconic Sunshine Skyway Bridge across Tampa Bay.

Figg issued a statement Thursday saying the company was "stunned" by the collapse and promising to cooperate with investigations.

"In our 40-year history, nothing like this has ever happened before," the company's statement said. "Our entire team mourns the loss of life and injuries associated with this devastating tragedy, and our prayers go out to all involved."

MCM Construction Management, which was building the bridge, posted a message on the company's Facebook page promising "a full investigation to determine exactly what went wrong."

Robert Bea, a professor of engineering and construction management at the University of California, Berkeley, said it was too early to know exactly what happened, but the decision to use what the bridge builders called an "innovative installation" was risky, especially because the bridge spanned a heavily traveled thoroughfare.

"Innovations take a design firm into an area where they don't have applicable experience, and then we have another unexpected failure on our hands," Bea said after reviewing the bridge's design and photos of the collapse.

Witnesses describe harrowing Florida bridge collapse: "It's totally smashed to the ground"

The FIU community, along with Sweetwater and county officials, held a "bridge watch party" March 10. That's when the span was lifted from its temporary supports, rotated 90 degrees across an eight-lane thoroughfare and lowered into its permanent position over the busy road.

FIU President Mark Rosenberg said during a news conference that tests were being done on Thursday. Authorities said two construction workers were on the bridge when it collapsed; it's unclear what the tests were or if they contributed to the failure.

"This bridge was about goodness, not sadness," Rosenberg said. "Now we're feeling immense sadness, uncontrollable sadness. And our hearts go out to all those affected, their friends and their families. We're committed to assist in all efforts necessary, and our hope is that this sadness can galvanize the entire community to stay the course, a course of goodness, of hope, of opportunity."

Mayor Orlando Lopez of Sweetwater, Florida, said he was notified of the bridge collapse by a local business owner who called him with the devastating news.

"My heart stopped. I could hear the crackle in his voice as he explained to me that the bridge collapsed and there are vehicles trapped under it. I couldn't believe that this very bridge that was being erected to provide safe transfer between students of FIU to the city of Sweetwater actually collapsed. It is a very tragic day."

View CBS News In