The nude body of a woman found Saturday in a remote, brushy area of Dulles International Airport was identified yesterday by the FBI as that of Robin Caroline Arnold, a 27-year-old woman who had been living near Manassas and working in the District of Columbia as a prostitute.

Al Hein, a spokesman for the FBI's Alexandria office, said it was not yet clear how Arnold had died, but that her death is "being investigated as if it were a homicide."

Arnold's body was found Saturday morning about 20 feet off of Normans Station Road, Hein said, in the northernmost section of the sprawling Dulles airport property.

He said she appeared to have been dead a week or more, but declined to say whether she had died where she was found or died elsewhere and her body taken to Dulles.

James Beyer, the medical examiner for Northern Virginia, said yesterday Arnold's body was badly decomposed but showed no signs of stab or bullet wounds or strangulation.

He said toxicological and other tests will be performed.

D.C. Superior Court records show that Arnold, who lived at 7493 Princess Carol Ct., near Manassas, had been arrested 20 times since June 1983 for a variety of offenses, including 15 arrests for sexual solicitation.

The records also show at least half a dozen convictions for solicitation during that period. Arnold was most recently arrested May 15.

There have been at least three slayings of District prostitutes since January, one in the District and two in Prince George's County, but officials said yesterday that Arnold's death did not appear connected to the others.

Arnold grew up in Baltimore, according to her brother, Dennis Arnold, a Baltimore flower shop owner. He said she had not been in touch with the family "for quite some time."

Dave Hess, a spokesman for the Federal Aviation Administration, which owns Dulles, said Arnold was found by "a man driving a pickup truck who was making a delivery to a farm in the area and stopped to answer the call of nature."

Hess said that on Monday, FAA police combed the area where Arnold's body was found "but found nothing."

Washington Post staff writer Saundra Saperstein contributed to this report.