The White House has received a suspicious
letter similar to ones sent to New York Mayor Michael Bloomberg that
were believed to contain the poison ricin, the US Secret Service said
In a brief statement, the Secret Service confirmed the White House mail screening centre had "intercepted a letter addressed to the White House that was similar to letters previously addressed to Mayor Bloomberg in New York."
It was being tested by the FBI's Joint Terrorism Task Force, the Secret Service said.
New York Mayor Michael Bloomberg was the intended recipient of a threatening letter. Preliminary tests showed it had been laced with the deadly poison ricin, according to US media reports Wednesday.
A second ricin-laced letter was found in a building in Washington that houses an organization founded by Bloomberg that pushes for stricter gun controls - Mayors Against Illegal Guns.
Ricin-laced letters were also sent to the White House and a US senator last month. A man has been arrested in connection with sending those letters.
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