Authorities said they believe he may be trying to flee to Bermuda or Peru on a 72-foot yacht called "Serenity" he docked on Long Island, N.Y.
Bermuda's police and maritime authorities said Tuesday evening there was no indication that Rockefeller's yacht had entered or neared the British territory's waters.
Boston police found the sport utility vehicle allegedly used in the kidnapping and were questioning the driver Tuesday. Police declined to identify the driver.
Rockefeller used at least four known aliases and told people he met different stories about his background. Some acquaintances knew him as a physicist, some as a mathematician and others were told he was involved in financial services.
Rockefeller's visit with his daughter Sunday in Boston was the first time he had seen the girl known as "Snooks" since a new visitation order was approved several months ago. The girl lives in London with her mother, a senior partner in the London office of the management consulting firm McKinsey & Co.
Boss married Rockefeller on Nantucket in 1995 and filed for divorce in Suffolk Probate and Family Court in Boston in January 2007. The final decree was issued in December, and the records were sealed, at the request of both.
During their 12-year marriage, the couple lived a lavish lifestyle. They owned a brownstone in Boston's tony Beacon Hill near Sen. John Kerry and a mansion in Cornish, N.H., a summer resort favored by artists and writers.
Rockefeller was a director at Boston's exclusive Algonquin Club, but resigned about three months ago, said club manager Lassaad Riahi.
Fraser Seitel, a spokesman for the descendants of John D. Rockefeller Sr., said Clark Rockefeller was not descended from that side of the wealthy family. He said there is no indication the fugitive was descended from William Rockefeller, John D. Rockefeller Sr.'s only sibling.
