BREAKING: McCain says missing Army Staff Sgt. Emil Rivera-Lopez is from Tucson

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TUCSON, AZ (3TV/CBS 5) -

U.S. Army Staff Sgt. Emil Rivera-Lopez, who is presumed dead by the Department of Defense after a helicopter crash last week, is from Tucson, according to Arizona Senator John McCain.

McCain tweeted on Saturday morning, "Cindy & I send our condolences & heartfelt prayers to the friends & family of SSgt Rivera-Lopez of #Tucson. RIP."

Arizona Senator Jeff Flake also tweeted out his condolences: "Cheryl and I express our deepest condolences to the family of Staff Sgt. Rivera-Lopez. You are in our prayers."

On August 25, a U.S. Army UH-60 Black Hawk helicopter with six troops on board crashed during a training exercise off the coast of Yemen. Five of the troops were rescued, but the sixth was not located. Yesterday, the DoD declared the missing solider dead.

The cause of the crash is under investigation.

The military has a small number of troops deployed in Yemen to aid the fight against an al-Qaida group in the country. It has conducted ground raids this year against the terrorist group there, including an operation in late January in which Navy SEAL Chief Petty Officer William Owens was killed, and an MV-22 Osprey tilt-rotor aircraft was destroyed after it crashed.

We are working to get more information from the Department of Defense now.

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