Actor Leonardo DiCaprio¬†made a secret appearance before a grand jury recently to testify as part of the US Justice Department’s investigation into 1MDB, reported the Washington Post.

According to sources close to the case, grand jury proceedings are secret, so it was unclear what DiCaprio told grand jurors and how authorities got him into and out of the federal courthouse without drawing notice.

The report added that prosecutors consider DiCaprio a witness who can provide useful insights about Malaysian businessman Low Taek Jho or better known as Jho Low who is alleged to have laundered billions of dollars from the investment fund and then financed a lobbying campaign to end the investigation.

DiCaprio is, however, not a target of the probe.