Two workers at a redevelopment site near Boston Harbor were killed when a construction crane toppled from a barge on the Mystic River on Friday, authorities said.

One worker was pronounced dead at a hospital and another died at the scene, the police chief for the city of Everett, Paul Strong, said at the scene.

One of the victims had to be extracted from the downed crane, the chief said. Their identities will be released after family is notified, he said.

Everett Mayor Carlo DeMaria told NBC Boston that the victims were "young men" who worked for a private company helping to dismantle the onetime fuel terminal, which opened in 1965.

"May they rest in eternal peace," DeMaria said of the men.

The estimated time of the collapse on Friday was unavailable.

It's not clear why the crane c

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