Authorities have intercepted a letter to the White House that tested positive for ricin poison, according to multiple media reports.

The Secret Service has acknowledged the letter addressed to President Obama contained a suspicious substance but has not stated it was ricin, a deadly poison.

On Tuesday, lawmakers revealed that a letter addressed to Sen. Roger Wicker (R-Miss.) had tested positive for the poison.

The Secret Service said the letter was sent to Obama on April 16 and was discovered at an remote White House mail screening facility.

“This facility routinely identifies letters or parcels that require secondary screening or scientific testing before delivery,” the Secret Service said in a statement. “The Secret Service White House mail screening facility is a remote facility, not located near the White House complex, that all White House mail goes through.”

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