Updated

The Francis Scott Key Bridge along I-695 in Maryland collapsed into the Baltimore harbor following a "ship strike" early Tuesday morning, setting off a search and rescue mission for those who plunged into the chilly waters.

A livestream of the bridge at about 1:30 a.m. showed a cargo ship colliding with a support beam, causing the bridge to break apart and fall into the Patapsco River. Multiple vehicles were on the bridge at the time, but no update on casualties has been offered.

Eight members of a construction crew that was doing routine work filling potholes on the bridge fell into the water, Paul Wiedefeld, secretary of the Maryland Department of Transportation, told reporters. Six of these members were unaccounted for, while two were rescued. One of the rescued members was in the hospital, while the other refused treatment.

When asked about how many vehicles went into the water and the condition of those people that were in the vehicles, Weidefeld said no information was available at this time.

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Officials are continuing to respond to the catastrophic collapse as an active search and rescue mission, with the U.S. Coast Guard searching for any survivors in the water. The water below the bridge is about 50 feet deep, and the water temperature was about 47 degrees at the time of the collapse.

President Biden addressed the collapse in prepared remarks on Tuesday afternoon, saying that the federal government is sending "all the federal resources they need" and that "we will rebuild this port together."

"It’s my intention that the federal government will pay for the entire cost of reconstructing that bridge, and I expect the Congress to support my effort," the president said, adding that while this effort will take some time, the people of Baltimore "can count on us." 

President Joe Biden

President Biden delivers remarks on the Francis Scott Key bridge collapse in the Roosevelt Room of the White House on Tuesday. (AP Photo/Evan Vucci)

When responding to a reporter's question about whether the company that manages the ship should be held responsible for the costs, Biden said the federal government would not wait for any decisions and would step in to get the bridge rebuilt and opened.

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The FBI was on scene investigating what caused the ship to ram into the bridge and said it was not linked to terrorism. 

When asked whether the ship lost power before striking the bridge, Maryland Gov. Wes Moore said that the ship's crew alerted authorities about a power issue before the impact. The mayday call gave authorities time to limit water traffic under the bridge and vehicle traffic across the span.

Emergency crews including the U.S. Coast Guard, local first responders and the FBI were searching for people believed to be in the water, Kevin Cartwright, director of communications for the Baltimore Fire Department, told The Associated Press around 3 a.m. Officials have described this as a mass casualty event.

"Our focus right now is trying to rescue and recover these people," Cartwright said.

cargo ship under mangled steel from bridge

There was a crew of 22 onboard the Singapore-flagged container vessel Dali. (Baltimore Fire Rescue 1)

Baltimore Fire Chief James Wallace said at least two people were pulled from the water following the collapse, with one of them in serious condition.

Wallace said authorities "may be looking for upwards of seven people" but he said that number could change.

The cargo ship that hit the bridge was the Dali, a 95,000 GT Singapore-flagged container ship, the Maritime and Port Authority (MPA) of Singapore confirmed. There were 22 crew members onboard at the time of the incident.

cargo ship under mangled steel from bridge

Singapore's Maritime Port Authority said it is working with the U.S. Coast Guard in its investigation. (Baltimore Fire Rescue 1)

The Synergy Group, a Singapore-based company that manages the ship, said in a statement that two pilots piloting the ship through the harbor and all crew members onboard were accounted for and there are no reports of any injuries. The group also said that no pollution has been reported.

The large vessel appeared to catch fire before becoming disabled. Footage of the incident shows the lights going out multiple times on the vessel in question prior to impact, suggesting the collision may have been due to a power failure.

The Maryland Transportation Authority said on social media that all lanes are closed in both directions and that traffic is being detoured. Later, it urged drivers to avoid the I-695 southeast corridor and to instead use I-95 or I-895.

A White House official says they're actively monitoring the situation but have so far observed "no indication of any nefarious intent," according to ABC News.

"Our hearts go out to the families of those who remain missing as a result of this horrific incident," the White House said in a statement.

Mayor Brandon M. Scott and Baltimore County Executive Johnny Olszewski Jr. confirmed emergency personnel were responding and rescue efforts were underway.

Cartwright said agencies received 911 calls around 1:30 a.m. that a vessel traveling from Baltimore had struck the bridge, causing it to collapse. 

"This is a dire emergency," Cartwright added.

The collapse comes just two days after the 47-year anniversary of the bridge's construction, which was completed  on March 24, 1977.

Location where the Francis Scott Key Bridge collapsed into the Patapsco River

Location where the Francis Scott Key Bridge collapsed into the Patapsco River. (Fox News)

He said there are "some cargo or retainers hanging from the bridge" acting as hazards that are creating potentially unsafe and unstable conditions. Emergency responders are operating cautiously as a result.

"[At] 1:35 a.m., Baltimore City police were notified of a partial bridge collapse, with workers possibly in the water, at the Francis Scott Key Bridge," a spokesperson for Baltimore Police said in a statement to Fox News.

The FBI says it has agents at the scene working alongside first responders.

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Multiple emergency crews are on the scene assessing the damage and investigating the cause, Fox Baltimore reported.

As of 2:45 a.m., all live camera feeds for the bridge, along I-695, on the Maryland Transportation Authority website are offline.

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The iconic bridge is named after Francis Scott Key, who authored the American National Anthem, "The Star-Spangled Banner." It opened in 1977.

This report is developing and will be updated.

Fox News' Melissa Summers and the Associated Press contributed to this report.