Rescue teams are continuing to search for survivors of a deadly bridge collapse at Florida International University in Miami.
Images of crushed cars beneath the buckled structure were shared across social media on Thursday.
A Florida Highway Patrol official said there were several fatalities, but police have yet to confirm a number.
It was unclear how many people were trapped in at least eight vehicles beneath the bridge, officials said.
“This is going to be a long incident. We are going to have rescuers here through the night, if not longer,” Miami-Dade Fire Chief Dave Downey said on Thursday.
At least 10 people were treated for injuries, including two in “extremely critical condition”, according to Dr Mark McKenney, director of general surgery at Kendall Regional Medical Center.
Florida Highway Patrol Lt Alejandro Camacho told CBS News there were several fatalities.
The 950-ton (862-tonne), 174-foot (53m) bridge was erected on Saturday in just six hours over an eight-lane motorway, according to a story posted on the college website.
Aerial footage shows first responders trying to get under the bridge to trapped cars.
“We’re working our way into the pile trying to create holes that we can actually physically see,” Miami-Dade Fire Department Division Chief Paul Estopian told reporters.
A witness told ABC News that the screams coming from the cars were “terrifying”.
“As soon as I looked outside, I saw dust flying everywhere,” Tiona Page said. “I knew the bridge had collapsed.”