Station went off the air as the bomb squad has a look. From the LAT:
The Wilshire Boulevard office was cleared after a beeping package was dropped off at a second-floor lobby about 8:20 a.m., according to Los Angeles police. A bomb squad is en route. KNX's Randy Kerdoon tweeted that two packages were discovered and confirmed one was beeping.
Station switched over to SF's KCBS (they're handling Socal traffic and weather). The entire building on Miracle Mile has been evacuated.
*Update: Police have given the all clear and KNX is back on air. Turns out that the beeps were coming from a couple of clocks that had been brought into the station.