Poisonous Substance in Parcel Sent to Obama

Authorities have intercepted a parcel sent to the White House that tested positive for ricin. 

Barack Obama (Mark Wilson/Getty Images)

Updated 12:21 p.m. EDT: Secret Service officials say the letter tested positive for the poison ricin and was from the same sender who mailed the letter to Sen. Roger Wicker (R-Miss.) that also tested positive, NBC News reports. Federal officials told NBC News that they believe they know who sent the letters, but no arrest has been made. 

From the Hill:

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 a remove White House mail screening facility.

Read more at the The Hill.

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