An active investigation is under way in the special division of the department's victims, Shei said at a press conference Monday. Shey refused to provide further details.
Meanwhile, sources familiar with the investigation have told CNN that the accuser has filed a report against Blaine with the NYPD. However, according to sources, the claim is beyond the limitation period. It is unclear how the New York police will continue the investigation.
In addition, a source told CNN that an investigation had been carried out on Blaine about a year ago, but it has since been closed.
Blaine did not respond immediately to CNN's request for comment. In 1999, he was buried in a plexiglass coffin under a three-ton water-filled tank for seven days. Since then Blaine has closed in six tons of ice in Times Square for 58 hours, stood on the top of the 35-hour flag and spent 44 days in a glass box in London.
Blaine is scheduled for a European tour that begins in June.