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Search and rescue teams are carefully unearthing bodies and vehicles from the under the concrete bridge that collapsed suddenly in Miami on Thursday afternoon. And questions over the the bridge's design and construction are just beginning.

 had been lifted into place just five days earlier. At least six people were killed and 10 were injured in the collapse, according to the Associated Press.

Thursday night, Florida Sen. Marco Rubio tweeted: "The cables that suspend the #Miami bridge had loosened & the engineering firm ordered that they be tightened. They were being tightened when it collapsed today."

https://twitter.com/marcorubio/status/974486176336957440

Because the bridge's central tower and suspension cables were not yet installed, the Miami Herald 

 that any cables being tightened were likely wires that ran through the span that fell on Thursday.

 to make the crossing of a perilous seven-lane roadway safer for students and staff at Florida International University. The bridge connected the university campus to the small suburban city of Sweetwater, where many students and faculty live. An 

Rubio is an adjunct professor at the university. His spokeswoman told the newspaper that he had heard this information from workers on site.

At a press conference on Friday morning, assembled authorities would not confirm Rubio's statement.

"This is a tragedy we don't want to re-occur anywhere in the U.S.," said Juan Perez, director of the Miami-Dade Police Department. "Right now we just want to find out what occurred, what caused this collapse to occur and people to die."

Representatives from the National Transportation Safety Board and the Occupational Safety and Health Administration are investigating.

Designers of collapse bridge also did new I-35W span

Pedestrian crossing falls in Miami area, killing 6 and injuring several

"The people of South Florida have been though a lot, obviously, over the last several weeks and this is just yet one more tragedy to add to that sad book," said NTSB Chairman Robert Sumwalt.

Authorities said their investigation will take time, but early questions have emerged about whether it was wise to install the span across the road without first installing the central support tower.

Witnesses told WLRN the span fell without warning as a traffic light went red. Two workers were on the bridge when it collapsed, according to witnesses interviewed by the Miami Herald.

Last weekend, FIU tweeted a photo of what the completed bridge would look like.

https://twitter.com/FIUnews/status/972491113532571648

As USA Today reports, the design was for a type of suspension bridge called a cable-stayed bridge:

FIU offers an entire program around bridge projects like this one: the Center for Accelerated Bridge Construction, which opened in 2011. "This method of construction reduces potential risks to workers, commuters and pedestrians and minimizes traffic interruptions," the university said in a press release when the span was swung into space last weekend.

Much of the funding for the $14.2 million bridge and its plazas and walkways came from a U.S. Department of Transportation TIGER grant.

The bridge was designed by FIGG Bridge Engineers and built by MCM Construction. Both companies have been involved in bridge collapses before, as the AP reports:

Disasters

Sen. Marco Rubio tweeted that the bridge's cables were being tightened when it fell. At least six people were killed when the 950-ton bridge collapsed across a South Florida roadway Thursday.

As bodies are pulled from rubble, questions mount about Miami bridge

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