A Black Hawk helicopter crash Thursday off the coast of San Diego left two U.S. soldiers dead and three others injured, according to reports.

The U.S. Army Special Operations Command was conducting routine training off the coast of Coronado, Calif., – across the bay from downtown San Diego – when an “aircraft incident" occurred, an Army public affairs officer said, according to FOX 5 in San Diego.

“Our sincere condolences go out to the families and friends of the deceased,” the public affairs officer added.

The soldiers were later identified as Staff Sgt. Vincent P. Marketta and Sgt. Tyler M. Shelton.

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The Army’s Special Operation’s Command said the incident happened in the “vicinity of Coronado,” but did not elaborate, according to the San Diego Union-Tribune.

A Defense Department official told the newspaper the helicopter had crashed on San Clemente Island about 70 miles west of Coronado.

UH-60 Blackhawk helicopter crews from 3rd Battalion, 501st Aviation Regiment, Combat Aviation Brigade, 1st Armored Division completed aerial gunnery at Fort Bliss, Texas, December 12, 2017, maintaining their combat readiness and M240 machine gun skills.  U.S. Army photos by Capt. Tyson Friar, 1st Armored Division Combat Aviation Brigade Public Affairs

A UH-60 Black Hawk helicopter is seen at Fort Bliss, Texas, Dec. 12, 2017. (U.S. Army photo)

The official -- who spoke on the condition of anonymity -- said the incident involved members of the Army’s 160th Special Operations Aviation Regiment.

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The island is administered by Naval Base Coronado, but is part of Los Angeles County.

The incident is under investigation.

Last month, eight Marines and a sailor were killed when an Assault Amphibious Vehicle sank near San Clemente Island.

Fox News' Lucas Tomlinson contributed to this report.