Sources connected to Whitney Houston, who were with the singer on the day she died, told TMZ an individual removed all traces of cocaine from the room before authorities arrived.

The Coroner’s Office said Whitney Houston used cocaine “immediately prior to her collapse.” Investigators who arrived on scene found no traces of cocaine or any other illegal substance.

One source, who is extremely close to the situation, told TMZ that the individual who removed the cocaine was also the person who supplied it to Whitney Houston.

An individual removed all traces of cocaine from Whitney Houston’s hotel room before authorities arrived, say sources

Earlier reports claimed other items were removed from the Beverly Hilton Hotel room as well, including bed sheets.

The Beverly Hills PD told TMZ its investigation is not closed. Police will not comment on whether they are looking at evidence tampering.