Maryland Gov. Wes Moore declared a state of emergency after a cargo ship struck Baltimore's Francis Scott Key Bridge on Tuesday, causing it to collapse.

The collapse sent people and vehicles plunging into the icy, 50-foot-deep waters below. Six people who were on the bridge remain missing.

Photos show the aftermath of the Baltimore bridge's collapse.

[An aerial view of the cargo ship Dali in the wreckage of the Francis Scott Key Bridge in Baltimore. Tasos Katopodis/Getty Images]

Livestream video showed the ship striking a support beam at 1:28 a.m. Less than 10 seconds later, the bridge had completely collapsed.

[The cargo ship Dali is seen after running into and collapsing the Francis Scott Key Bridge. Tasos Katopodis/Getty Images]

Aerial photos taken hours later show pieces of the bridge sticking out of the water with twisted pieces of metal on top of the ship.

The ship lost power and broadcast a "mayday" distress call before striking the bridge.

[In an aerial view, the cargo ship Dali is seen after running into and collapsing the Francis Scott Key Bridge. Tasos Katopodis/Getty Images]

Six people remain missing since the collapse, Maryland transportation secretary Paul Wiedefeld said at a news conference Tuesday.

[Traffic remains closed at the Francis Scott Key Bridge. Rob Carr/Getty Images]

Authorities directed traffic on I-695 away from the wreckage.

The bridge spanned 10.9 miles and cost $60.3 million to build when it was completed in 1977, according to the Maryland Transportation Authority.

[A Maryland resident looks at Dali cargo vessel that crashed into the Francis Scott Key Bridge from Riviera Beach, Maryland. Nathan Howard/Reuters]

Maryland residents stopped to look at the scene of the crash.

The ship was visible from Riviera Beach, Maryland, about 13 miles from the bridge.

To see more photos of the Baltimore bridge collapse, head to Business Insider.

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