Threatening letters to Mayor Michael Bloomberg contained ricin poison, the NYPD reported today.
NYPD spokesman Paul Browne said this afternoon that anonymous threats were sent to the mayor in letters opened in the city Friday, as well as by the director of the group he started, Mayors Against Illegal Guns, in Washington, D.C., Sunday.
Preliminary tests showed the presence of ricin, according to the NYPD.
In the letters, the writer threatened Bloomberg and mentioned the gun law debate, Browne said.
No civilians who encountered the letters have symptoms, he said.
NYPD Emergency Service Unit police who came into contact with the letter are being examined for minor symptoms of ricin exposure that have since gone away, Browne said.
The FBI and NYPD are investigating the threats.