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The number of people who died after a newly placed pedestrian bridge collapsed at Florida International University has risen to six, as crews work to clear debris and wreckage from the scene in Miami-Dade County.

Authorities said Friday that the cables suspending a pedestrian bridge were being tightened after a "stress test" when the 950-ton concrete span collapsed over traffic.

As state and federal investigators worked to determine why the five-day-old span failed, Florida politicians pointed to the stress test and loosened cables as possible factors, and a police chief asked everyone not to jump to conclusions.

"This is a tragedy that we don't want to re-occur anywhere in the United States," said Juan Perez, director of the Miami-Dade police. "We just want to find out what caused this collapse to occur and people to die."

In addition to the six people who were found dead at the site, 10 others were transported to area hospitals, Miami-Dade Police said in an update on the accident Friday morning.

The pedestrian bridge was still under construction along the edge of Florida International University's campus when it collapsed Thursday afternoon on a major roadway, trapping motorists and passengers underneath.

"We have multiple victims; the number hasn't been determined yet," Miami Dade County Deputy Mayor Maurice Kemp said at a news conference Thursday afternoon.

Initially, authorities said four bodies had been recovered, but later, Miami Dade Police spokesman Alvaro Zabaleta said the remains of two more people had been removed from the debris.

"They're still working away at that concrete," Zabaleta said at a news conference early Friday.

"Engineers told us last night that it has to be done very carefully. Not only because we have to preserve evidence, not only because there might be possible victims under there and we have to treat it very delicately. But because of the safety of the rescuers," he said.

 showed the bridge collapsed onto a multilane highway, crushing vehicles underneath, and several people being loaded into ambulances.

https://twitter.com/FIU/status/974355007842725888

More than 100 search-and-rescue workers were using heavy equipment, search dogs and cranes, officials said.

Officials asked the public to avoid the area "indefinitely" and directed people worried about loved ones to get in touch with the family reunification center on FIU's campus.

In a news conference late Thursday evening, FIU President Mark Rosenberg recalled that his university's community had just celebrated over the weekend a milestone in the erection of the bridge, a project which was originally begun in 2010.

"This bridge was about collaboration, it was about hope, it was about opportunity, it was about determination," he said. Now we're feeling immense sadness, uncontrollable sadness."

"All we can do is promise a very thorough investigation -- getting to the bottom of this," Rosenberg said. "And mourn those who we've lost."

Figg Bridge Engineers designed the bridge and said in a statement it was "stunned by today's tragic collapse" and would fully cooperate in an investigation.

"In our 40-year history, nothing like this has ever happened before," the statement said.

, "Figg was fined for the South Norfolk Jordan Bridge collapse in 2012 in Virginia. According to the 

, the state issued four $7,000 fines" for violations that ranged from changing a girder to not performing inspections.

MCM Construction was building the Florida bridge and 

posted a statement expressing distress over the collapse and referring to a loss of life.

 the structure fell without warning around 1:30 p.m. as a traffic light went red and concrete fell on stopped vehicles. Other motorists rushed out of their cars to help.

The main span of the bridge was installed on Saturday. The bridge was not expected to open to foot traffic until early next year, reports The Associated Press.

It was intended to boost student safety, spanning a portion of U.S. Highway 41 known as the Tamiami Trail, to help people cross from campus to the city of Sweetwater, where the university said thousands of students live.

The university is currently on spring break.

The National Transportation Safety Board said it would send a "go team" to investigate the incident.

 the rapid installation of the "first-of-its-kind pedestrian bridge," which the AP explains allowed it to be "prefabricated then swung into place before its central support tower was built."

A now-deleted tweet posted by FIU on Tuesday displayed a photo of the bridge.

https://twitter.com/FIU/status/972529770683564033

In Tuesday's release, the university added, "The FIU-Sweetwater UniversityCity Bridge is the largest pedestrian bridge moved via Self-Propelled Modular Transportation in U.S. history. It is also the first in the world to be constructed entirely of self-cleaning concrete. When exposed to sunlight, the titanium dioxide in the concrete captures pollutants and turns it bright white, reducing maintenance costs."

White House press secretary Sarah Huckabee Sanders said President Trump is aware of the bridge collapse and will continue to monitor the situation.

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.

Both companies have been involved in bridge collapses before.

FIGG was fined in 2012 after a section of a bridge it was building in Virginia crashed onto railroad tracks and injured several workers, according to a story in The Virginian-Pilot.

MCM, meanwhile, was accused of substandard work in a lawsuit filed this month by a worker injured when a makeshift bridge MCM built at Fort Lauderdale International Airport collapsed under his weight. Another dispute resulted in a $143,000 judgment against MCM over an "arguable collapse" at a Miami-Dade bridge project.

A review of OSHA records, meanwhile, shows MCM has been fined for 11 safety violations in the past five years totaling more than $50,000 after complaints involving its Florida work sites.

Both companies expressed condolences for the victims and promised cooperation with investigators.

Local The FIU community, along with Sweetwater and county officials, held a "bridge watch party" on March 10 when the span was lifted from its temporary supports, rotated 90 degrees and lowered into what was supposed to be its permanent position.

FIU President Mark Rosenberg in a video shared on Twitter Friday that the "tragic accident of the bridge collapse stuns us, saddens us."

"The bridge was about collaboration, about neighborliness, about doing the right thing," he said. "But today we are sad and all we can do is promise a very thorough investigation in getting to the bottom of this and mourn those who we have lost."

The Associated Press contributed to this report.

Disasters

Amy Held

Author

The victims were in traffic beneath the bridge which was under construction. The main span was installed Saturday near the campus of Florida International University.

Rescue workers at the scene of a pedestrian bridge collapse. 

Pedestrian bridge collapses in Miami area, killing 6 and injuring several

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