A man was arrested and charged on Friday in connection with about 100 envelopes containing threatening letters and a suspicious powdery substance mailed from Oregon to members of Congress and the news media, authorities said.
A federal grand jury returned a two-count indictment charging Christopher Lee Carlson, 39, of the Portland area, with one count of mailing a threatening communication to a member of Congress and one count of mailing a letter threatening to use a biological weapon to a U.S. senator.
Carlson was arrested at his home on Friday morning, the U.S. Capitol Police said in a statement after an investigation it conducted with the FBI and U.S. Postal Inspection Service.
All the envelopes examined so far , which were postmarked in Portland and contained an unidentified white powder , have tested negative for any toxic substances, the U.S. Attorney's Office in Portland said in a statement announcing the indictment.
But both letters cited in the indictment, one sent to House of Representatives Speaker John Boehner, an Ohio Republican, and the other to Senator Barbara Mikulski, a Democrat from Maryland, contained threats to the lawmakers.
The letter to Mikulski, addressed to her Baltimore office, "indicated that it may contain a lethal pathogen to which the recipient may have been exposed," the indictment said.
"Threatening letters - whether hoax or real - are serious concerns that federal law enforcement agencies will aggressively pursue," Greg Fowler, special agent in charge of the FBI office in Oregon, said in a statement.
Neither the indictment nor the press release accompanying it made any mention of a possible motive for the mass mailings of menacing letters.
The federal prosecutor's statement said Carlson was expected to be arraigned in U.S. District Court on Monday.
The threatening letters began showing up on Capitol Hill and in the state offices of lawmakers on Feb. 22. A number of media organizations and television shows, including The New York Times, National Public Radio and "The Daily Show with Jon Stewart," also received such mail.
A law enforcement source at the time said the sender warned that letters had been sent to the Washington or local offices of all 100 U.S. senators and that 10 contained a deadly pathogen.
In 2001, in the wake of the Sept. 11 attacks on the World Trade Center and Pentagon, deadly anthrax-laced letters were sent to several news organizations and Senate offices.
Five people were killed and 17 sickened by those letters, which federal investigators said were ultimately traced to a U.S. Army scientist who committed suicide in 2008.
Policy expected to be fully implemented by next July, defense chief says
Extremism 'constitutes one of the most serious threats to international peace and security,' Council says
Navy investigation finds failures at multiple levels
Annual US Trafficking in Persons Report upgrades Thailand from lowest tier, but warns problem ‘remains large’
Strategy to retake northern city from ISIL is changed after original plan is leaked by MPs
Jewish lawmakers and former chief rabbi attack Labour Party leader for alleged remarks at anti-Semitism conference
According to an eyewitness, bomb attack left passengers 'shredded'
Countries pay tribute by lighting up buildings or monuments in Turkish colors in spontaneous response
Crowded field emerges as Britain’s largest political party begins process to elect David Cameron’s successor
Baghdad hit by series of fatal attacks only 2 days after government promised new security measures
Norwegian Court Approves Extradition of Mullah Krekar, a Terror Suspect
Iraq says air strikes destroy 260 IS vehicles fleeing Fallujah
Nicola Sturgeon met EU officials in Brussels Wednesday
Sameh Shoukry makes first visit as Egyptian FM to Palestinian Authority’s administrative capital in West Bank
Alvin died late Monday, Toffler Associates, the consultancy firm he founded, said in a statement without giving a reason for his death.
Police have shot a Palestinian who apparently attacked a Jewish settler