Baltimore bridge collapses after being struck by ship, six presumed ...

The steel frame of the Francis Scott Key Bridge sits on top of a container ship after the bridge collapsed. Photo: AFP / Roberto Schmidt

Warning: This story contains a video that may shock some viewers

Six construction workers missing after the Baltimore Bridge collapse are now presumed dead and rescue efforts have been suspended, police say.

It comes after a massive cargo ship smashed into the bridge while sailing out of Baltimore early on Tuesday, sending cars and people into the river below and closing one of the busiest ports on the US Eastern Seaboard.

Rescuers pulled out two survivors, one of whom was hospitalised, and searched for more in the Patapsco River after huge metal spans of the 1.6-mile (2.57 km) Francis Scott Key Bridge crumpled into the icy water around 1.30 am (local time).

Search and rescue will give way to a recovery effort, with divers that will resume in the morning.

The ship reported a power issue before impact, which enabled officials to stop traffic on the bridge before the collapse.

"By being able to stop cars from coming over the bridge, these people are heroes. They saved lives last night," Maryland Governor Wes Moore said at a briefing. The bridge was up to code and there were no known structural issues, Moore said.

There was no evidence of foul play, officials said.

Work crews had been repairing potholes on the bridge at the time of the collapse and sonar detected vehicles under the water, which was about 50 feet deep at that point, said Paul Wiedefeld, Maryland Secretary of Transportation.

Eight people were on the bridge at the time and six remained unaccounted for, the state's transportation secretary said hours after the collision, which closed one of the busiest ports in the United States.

The 948-foot (288.95m) vessel, as long as three football fields placed end to end, had experienced a momentary loss of propulsion and dropped anchors as part of emergency procedures before impact, its management company, Synergy Marine Pte Ltd reported, according to the Singapore Port Authority.

The Dali, owned by Grace Ocean Pte Ltd, collided with one of the pillars of the bridge, according to manager Synergy. All 22 crew members aboard the Singapore-flagged vessel were accounted for, it said.

Ship traffic was suspended at the Port of Baltimore until further notice. It is the busiest US port for car shipments, handling more than 750,000 vehicles in 2022, according to port data.

The closure of one of the US East Coast's major ports threatens to disrupt supplies of goods from cars, to coal and other commodities like sugar. It could create bottlenecks and increase delays and costs on the Eastern seaboard, experts say. The port handles the most car imports and is among the largest for coal exports.

President Joe Biden said the US Coast Guard responded quickly to the mayday call and commended the fast action of Maryland transportation officials who shut the bridge before it was struck and "undoubtedly saved lives."

He promised to visit Baltimore, 40 miles (64 km) away, as soon as possible and said he wanted the federal government to pay to rebuild the bridge, he said at the White House.

"I'm directing my team to move heaven and Earth to reopen the port and rebuild the bridge as soon as humanly possible," Biden said. The bridge, named for the author of the Star-Spangled Banner, opened in 1977.

The US Coast Guard reported the collapse at 1:27am and it deployed crews for an active search and rescue mission after the Singapore-flagged container ship forced the trellis-like bridge up into a mangled mass of metal.

Jayme Krause, 32, was working a night shift on shore when the cart of packages in front of her shook violently at around 2 a.m. in what sounded like an intense thunderstorm.

A coworker at an Amazon logistics facility told her the bridge had collapsed and she ran out to look.

The cargo ship Dali after running into and collapsing the Francis Scott Key Bridge. Photo: Tasos Katopodis / Getty Images via AFP

"I went over there, and sure as anything, it was gone, the whole bridge was just like, there was nothing there," she told Reuters. "It was a shocking sight to see."

She did not see anyone in the water, nor hear any cries for help from where she stood at the bay.

The Francis Scott Key bridge was the main thoroughfare for drivers between New York and Washington who sought to avoid downtown Baltimore. It was one of three ways to cross the Baltimore Harbour, with a traffic volume of 31,000 cars per day or 11.3 million vehicles a year.

Baltimore Mayor Brandon Scott described a scene of twisted metal shooting into the sky. "It was something out of an action movie. It was something you never thought you'd see," he said.

A live video posted on YouTube showed the ship ploughing into the bridge in darkness. The headlights of vehicles could be seen on the bridge as it crashed into the water and the ship caught fire.

The same ship was involved in an accident in the port of Antwerp, Belgium, in 2016, when it hit a quay as it tried to exit the North Sea container terminal.

A later inspection in June 2023 carried out in San Antonio in Chile found the vessel had "propulsion and auxiliary machinery" deficiencies, according to data on the public Equasis website, which provides information on ships.

#BREAKING Bridge in Baltimore, Maryland, collapses after being hit by a ship; mass casualty event reportedly declared | #6NewsAU pic.twitter.com/5UGNXEs98r

Tuesday's disaster may be the worst US bridge collapse since 2007 when the I-35W bridge in Minneapolis collapsed into the Mississippi River, killing 13 people.

The National Transportation Safety Board was sending a team to investigate.

Moore, the governor, declared a state of emergency to quickly deploy federal resources to deal with the emergency. The FBI in Baltimore said on X its personnel were on the scene.

The Dali was chartered by shipping company Maersk at the time of the incident, the Danish company said in a statement.

"We are horrified by what has happened in Baltimore, and our thoughts are with all of those affected," Maersk said.

Baltimore port's private and public terminals handled 847,158 autos and light trucks in 2023, the most of any US port. The port also handles farm and construction machinery, sugar, gypsum and coal, according to a Maryland government website.

The port handles imports and exports for major automakers including Nissan, Toyota, General Motors, Volvo, Jaguar Land Rover and the Volkswagen group - including luxury models for Audi, Lamborghini and Bentley.

General Motors and Ford Motor will reroute affected shipments, but the companies said the impact will be minimal.

More than 40 ships remained inside Baltimore port including small cargo ships, tug boats and pleasure craft, data from ship tracking and maritime analytics provider MarineTraffic showed. At least 30 other ships had signalled their destination was Baltimore, the data showed.

This story was originally published by Reuters.