The Treasury Department is reportedly investigating whether Robert Redford, the actor and film director, violated U.S. law during a recent three-day trip to Cuba.

However, an attorney for Redford says it's not an investigation.Redford, 50, returned from Cuba last May from what he described as a script-writing workshop for women in Havana. Redford, whose latest film, "The Milagro Beanfield War," is showing in Cuban and American theaters, said he also met with Cuban President Fidel Castro.

Scripps Howard News Service reported Thursday that Richard Newcomb, director of the Treasury enforcement office in Washington, wrote Redford May 11 and asked him to explain whether he paid his own expenses or whether they were paid by Cuba. He also wanted to know how and where he entered the country.

Vincent Chieffo, an attorney for Redford in Los Angeles, confirmed Thursday that the actor received a letter from the Treasury Department asking about his trip to Cuba.

"I wouldn't really call it an investigation. They sent a letter and we told them the facts," Chieffo said.

Earlier, Redford told The Washington Post that he "chatted briefly" with Castro and was invited to lead a film school workshop in Havana next year. Redford said he plans to invite Latin American filmmakers to the Sundance Institute, his film production facility in Utah.