Some of Hillary Clinton’s closest aides, including her longtime adviser Huma Abedin, have provided interviews to federal investigators, as the FBI probe into the security of her private email server nears completion, U.S. officials briefed on the investigation tell CNN. The investigation is still ongoing, but so far investigators haven’t found evidence to prove that Clinton willfully violated the law the U.S. officials say.

In recent weeks, multiple aides have been interviewed — some more than once, the officials said. A date for an FBI interview of Clinton has not been set, these officials said, but is expected in the coming weeks. Abedin has cooperated with the probe, the officials said. Lawyers for Abedin declined to comment. The officials say the interviews of Clinton and her aides would be a routine part of an investigation like this.