Timeline of Baltimore's Francis Scott Key Bridge collapse

The Dali container ship unmoors from the port in Baltimore and begins to move, per MarineTraffic data analyzed by CNN. Its destination was Colombo, Sri Lanka.

The Dali's lights flicker as it travels down the Patapsco River, according to video from the scene.

The ship begins to change course toward the Key Bridge's pillar, CNN analysis shows.

The ship's lights continue to flicker on and off, video shows.

The ship hits the Key Bridge, quickly causing it to collapse, the US Coast Guard said. The Coast Guard immediately deploys personnel to the scene.

The 911 center dispatches call to Baltimore City Fire Department for reports of water rescue in the Patapsco River, according to Baltimore Fire Chief James Wallace. As units were responding, fire officials started receiving calls of multiple people in the water.

The first fire unit arrives and reports a complete collapse of Key Bridge, Wallace said. The fire department is given information that there were "likely multiple people on the bridge" and, as a result, were now in the water, Wallace said.