One man died and a second was in “very critical” condition after they were found last night in the Potomac River near Georgetown, authorities said.

Witnesses reported seeing two men go into the water and not coming to the surface, the D.C. Fire and EMS department  said.

The report touched off a search near the Key Bridge involving four boats from the fire department as well as equipment and personnel from other agencies.

It was not immediately clear whether the two men had been in a boat, or whether they had entered the water from the river bank.

A witness who declined to be identified by name said one of the two men appeared to t ry to jump into the river from a high point near the District side of Key Bridge. He said it appeared that the man was injured during the attempt and that the second man jumped in to try to save him.

How long they had been in the water before being found was also unclear. However, based on comparison of accounts from the witness and authorities it may have been longer than 45 minutes.

The Key Bridge connects the District with the Rosslyn area of Arlington

This story has been updated.