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Part of a U.S. Navy helicopter that crashed off the coast of Virginia, killing two crew members, has been found as searchers continue to look for a crewman who has been missing since the incident Wednesday morning.

The helicopter, a MH-53E Sea Dragon, was carrying five crew members when it made an emergency landing in the Atlantic Ocean off the coast of Norfolk. Four crew members had been rescued from the water, the Navy initially said, but two of the four rescued were confirmed to be dead later on Wednesday.

On Thursday, the Navy said part of the MH-53E had been found by searchers, Reuters reported. The two surviving crew members were taken to Sentara Norfolk General Hospital; one was listed in serious condition on Thursday, and one in fair condition, according to NBC Virginia affiliate

None of the crewmembers' identities were released.

The Navy said it took about a half hour to rescue the first two sailors after a distress call went out at around 10:45 a.m., reported The other two sailors were rescued within an hour of the distress call.

The MH-53E was conducting a routine training mission when it made the emergency water landing about 20 nautical miles east of Virginia Beach, a U.S. Navy official said. It was conducting the training mission in tandem with another MH-53E at the time.

Nearby Coast Guard assets were first to respond when the helicopter went down. U.S. Navy helicopters responded soon after to help with the search and rescue of the missing sailors.

The aircraft is part of the Helicopter Mine Countermeasures Squadron, based at Naval Air Station Norfolk.The crash came a day after four American airmen were killed when a U.S. military helicopter carrying live ammunition crashed on the east coast of England.

The MH-53E does not carry any weapons. It performs airborne mine countermeasures and onboard delivery missions, according to the Naval Air Systems Command website.

It is not clear what caused the crash.

NBC News' Courtney Kube and Jim Miklaszewski contributed to this report.