Suspicious Letter Addressed To President Obama May Contain Ricin
WASHINGTON, D.C.--Officials say a letter addressed to President Obama contained a suspicious substance believed to be ricin.
Police say they might know who has been sending the letters.
Another letter was sent to Senator Roger Wicker. That letter was postmarked from Memphis, Tennessee and authorities say it tested positive for ricin.
Officials say the mail facility has been closed for more testing. Ricin is a poison that is extremely deadly.