A professional complex that houses the production companies of both Tom Cruise and Salma Hayek has been hit with an anthrax scare.

According to E! News, a building-wide memo gone out informing all tenants of the Los Angeles’ MGM Tower that a anonymous phone call was made to the building’s main switchboard, stating a deadly virus would be placed into the building’s ventilation system, starting on the 20th floor.

The memo that circulated around the building stated that “due to lack of credibility of the threat, the building, LAPD and MGM are not recommending that we take any actions.”

Although engineers examined the ventilation system and found no signs of tampering, outside air has been blocked from entering the building and security was tightened on the complex’s heat- and air-control rooms by prohibiting tenants or guests from entering the areas.

No word whether Cruise or Hayek were in the building at the time of the scare.