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WASHINGTON, March 27 (Reuters) - The remains of three kidnapped U.S. security contractors in Iraq have been recovered and returned to the United States, the FBI said on Thursday.

The agency said Paul Christopher Johnson-Reuben of Buffalo, Minnesota, and Joshua Mark Munns of Redding, California, both of whom were employed by Crescent Security Group when kidnapped on Nov. 16, 2006, have been identified.

The FBI said the remains of a third victim also have been recovered but it was still testing to confirm his identity.

On Monday, the FBI said it recovered the remains of two other kidnapped security contractors in Iraq. They were identified as Ronald Withrow of Roaring Springs, Texas, who worked for JPI Worldwide when kidnapped on Jan. 5, 2007, and John Roy Young of Kansas City, Missouri, who also worked for Crescent Security when kidnapped on Nov. 16, 2006.

"The investigation is ongoing and the FBI ... will continue to aggressively investigate every available lead in order to identify, apprehend and bring to justice those responsible for these horrific criminal acts," FBI spokesman Richard Kolko said in a statement. (Reporting by James Vicini; Editing by Bill Trott)

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