Police say a threatening letter smeared with what appeared to be blood has been sent to mayoral candidate and New York City Public Advocate Bill de Blasio.
Police Commissioner Raymond Kelly says the letter was rambling, written in Spanish and said: "this is real blood."
It was received last Friday at the public advocate's office and had a Bronx return address. Police say a second letter apparently from the same person appeared Wednesday and was not opened. Police are investigating.
A spokesman for De Blasio had no comment.