Boston Police said a video obtained Tuesday morning contains new evidence placing a missing man from Harvard near the Charles River Dam the night he disappeared.

Crews have been searching waterways for 22-year-old Zachary Marr since he went missing Feb. 13. He was last seen at Boston's Bell in Hand Tavern. A dive team continued that effort on Tuesday in the Charles River near Nashua Street.

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The Boston Globe first reported on the new evidence Tuesday. Police Commissioner William Evans told the Globe the footage "shows a male heading toward the water and disappearing" under the Zakim Bridge, a half-mile walk from the Faneuil Hall bar.

"We believe that is him. It's a sad case," Evans told the paper.

Police previously confirmed the existence of the footage for Metro, but a spokeswoman said she could not describe its contents.