A Las Vegas warehouse belonging to magician David Copperfield has been raided by FBI agents.
David Copperfield is regularly seen performing in Las Vegas
They took a computer hard drive, a digital camera memory chip and $2m (£937,000) in cash, Las Vegas TV station KLAS said.
Copperfield's lawyer said a woman had made "serious allegations" against the magician, but insisted they were false.
Copperfield, 51, is known for his stunts, such as apparently walking through the Great Wall of China.
"We're just confirming that investigative activity took place at the warehouse," David Staretz, chief division counsel, for the FBI in Las Vegas, told Reuters news agency.
However, the FBI would not explain the reasons for the raid, saying only that the investigation was related to a case in Seattle.
Copperfield's attorney, David Chesnoff, issued a prepared statement saying it was important the allegations be put into perspective.
"An unidentified woman has made serious allegations against David Copperfield," Mr Chesnoff said.
"Although authorities have not revealed her identity to us, we know these allegations are false because David Copperfield has never forced himself on anyone."
On Wednesday night, Copperfield performed two shows at the MGM Grand Hotel and Casino, the final performances of his latest run there.
He performs stints of between six and eight weeks there several times a year, MGM Mirage spokeswoman Yvette Monet said.
The illusionist is next scheduled to perform in Jakarta, Indonesia, on Tuesday.
Copperfield has won several Emmy awards for his work.
His other feats include escaping from the infamous Alcatraz prison and seemingly making the Statue of Liberty disappear.