White Powder Mystery: Who's Out to Get CBS Studios?!

Network's mail room has received third suspicious package this year

What's going on here?

First an envelope containing a suspicious white powder was sent to the Dancing With the Stars mailroom when hot-button contestant Bristol Palin was on the show, then an envelope with a white substance addressed to Craig Ferguson's Late Late Show at CBS, and now it seems the network has been hit again for the third time in the past year.

Here's what happened...

E! News confirms that a call came in at around 2:05 p.m. reporting a suspicious package at CBS Studios' mail room on the 7800 block of Beverly Boulevard in Los Angeles, Calif.

The police department was dispatched to investigate and told E! News that Hazmat was there trying to figure what the substance was. By 4 o'clock, LAPD concluded that the suspicious envelope had been cleared and that there was no threat associated with the incident.

While this latest letter was also addressed to Dancing with the Stars, it is unclear if the envelope was for a specific DWTS castmember.

—Reporting by Holly Passalaqua