From the Washington Post:
NPR received a bomb threat Monday, five days after its decision to fire news analyst Juan Williams sparked a hugely negative reaction.
Sources at the news organization said the threat was received via U.S. mail and was immediately turned over to local police and the FBI. The organization did not publicly disclose the threat or release details, on the advice of law enforcement officials.
The letter didn’t reference the Williams firing specifically, but people at NPR, who spoke about it on the condition of anonymity, said the timing and tone suggested it was sent after Williams’s widely publicized termination.
I’m sure Mr. Williams’s firing had nothing to do with it; it was probably from a disgruntled listener who got bad advice from the guys on Car Talk.