A white powder discovered in an envelope addressed to Los Angeles Mayor Antonio Villaraigosa was probably chalk, according to police.
A portion of the mayor’s office on the third floor of City Hall was evacuated Thursday afternoon after one of Villaraigosa's employees discovered the white substance and alerted authorities.
The envelope also included a “threatening letter” addressed to Villaraigosa, according to Los Angeles Police Cmdr. Blake Chow. He said it appears the envelope may have been sent from a correctional facility out of state.