The FBI said on Wednesday that an investigation into mail containing a suspicious substance addressed to a lawmaker and to President Barack Obama has not found a link to the attack in Boston.
"The investigation into these letters remains ongoing, and more letters may still be received. There is no indication of a connection to the attack in Boston," the FBI said in a statement.
The envelope addressed to Obama was immediately quarantined by the U.S. Secret Service, the FBI said.
Filters at a government mail screening facility preliminarily tested positive for ricin on Wednesday morning and mail from that facility was being tested, the FBI said.
"Only a full analysis performed at an accredited laboratory can determine the presence of a biological agent such as ricin. Those tests are currently being conducted and generally take 24 to 48 hours," the FBI said.
(Reporting by Tabassum Zakaria; Editing by Vicki Allen)
KIEV/DONETSK - A mediator from Europe's OSCE security body headed to eastern Ukraine on Saturday seeking the surrender of pro-Russian separatists as the Kiev government declared an Easter truce following a peace accord with Moscow. | Video
- South Korea recovers first bodies from inside sunken ferry |
- Iran says it watered down, converted over 200 kg of enriched uranium
- In Damascus, Christians briefly ignore war for Easter
- New militant group claims responsibility for Friday blast in Cairo
- U.N. peace envoy criticizes Israeli Easter security in Jerusalem
- High stakes as restive Benghazi votes in Libyan local polls
- Sudanese militants kill two, kidnap three at oil field