Suspicious envelopes sent to Trump, military officials

WASHINGTON (AP) — Authorities were investigating two envelopes suspected of containing poison that were addressed to top military chiefs and a third with unknown contents sent to President Donald Trump.

In a statement Tuesday evening, the Secret Service confirmed that a suspicious envelope had been sent to the president on Monday, but was not received at the White House, nor did it ever enter the White House. The agency did not disclose any details about what was in the envelope or where it was received. The White House had no comment.

Authorities at a Pentagon mail screening facility were investigating two envelopes suspected of containing a poison, ricin, made from castor beans. Those letters were addressed to Defense Secretary Jim Mattis, who is traveling in Europe this week, and the Navy's top officer, Adm. John Richardson, a defense official said.

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Cases involving ricin throughout history
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Cases involving ricin throughout history
UNDATED- In this undated handout image from the Metropolitan Police, April 14, 2005, is seen cherry stones found in scales, which can be used for cyanide. Algerian Kamel Bourgass was convicted of plotting to spread ricin and other poisons. During a police search of premises in London, January 5, 2003 detectives discovered residue from a homemade poison, together with recipes and instructions for making poisons and explosives. (Photo by Metropolitan Police via Getty Images)
Shannon Richardson is pictured in this booking photo, courtesy of Titus County Sheriff's Office, made available on June 8, 2013. Richardson has been arrested on suspicion of sending ricin-laced letters to U.S. President Barack Obama and New York Mayor Michael Bloomberg, a spokeswoman for the U.S. Attorney's Office in the eastern district of Texas said on June 7, 2013. REUTERS/Titus County Sheriff's Office/Handout (UNITED STATES - Tags: CRIME LAW ENTERTAINMENT TPX IMAGES OF THE DAY) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS
Everett Dutschke works on his mini-van in his driveway in Tupelo Mississippi on April 26, 2013. Federal agents arrested Dutschke on Saturday after his home and a former business were searched as part of an investigation into ricin-laced letters sent to President Barack Obama and two other public officials. Picture taken on April 26, 2013. REUTERS/Thomas Wells (UNITED STATES - Tags: CRIME LAW)
Itawamba County Sheriff Officers search the grounds of the home of Melvin Kitchens as they try and help federal authorities locate Everett Dutschke near the town of Kirkville, Mississippi , April 25, 2013. Members of an anti-terrorist response team from the Mississippi National Guard wearing hazmat suits had already searched the Tupelo home of Dutschke on Tuesday. REUTERS/Thomas Wells/Daily Journal (UNITED STATES - Tags: CRIME LAW)
22-year-old Steven Michael Ekberg of Ocala, Florida is shown in a Marion County Sheriff's Office booking photo after he was arrested by the FBI, on January 12, 2005. Police found the biotoxin ricin in his possession in the home he shares with his mother. He is being charged with possession of a biological weapon. REUTERS/Handout-Marion County Sheriffs Office JLS/GN
UNDATED- In this undated handout image from the Metropolitan Police, April 14, 2005, is seen salterscales. Algerian Kamel Bourgass was convicted of plotting to spread ricin and other poisons. During a police search of premises in London, January 5, 2003 detectives discovered residue from a homemade poison, together with recipes and instructions for making poisons and explosives. (Photo by Metropolitan Police via Getty Images)
UNDATED- In this undated handout image from the Metropolitan Police, April 14, 2005, is seen wallet containing 11 passport style pictures of Bourgass. Algerian Kamel Bourgass was convicted of plotting to spread ricin and other poisons. During a police search of premises in London, January 5, 2003 detectives discovered residue from a homemade poison, together with recipes and instructions for making poisons and explosives. (Photo by Metropolitan Police via Getty Images)
UNITED STATES - FEBRUARY 04: The Marine haz-mat team from Dover Delaware along with the Coast Guard and the U.S. Capitol Police prepare to enter the Russell Senate Office Building during the ricin scare. (Photo By Douglas Graham/Roll Call/Getty Images)
WASHINGTON - FEBRUARY 5: Congressional employees wait for the re-opening of the Senate Russell Office Building, one of the three Senate office buildings that were closed, February 5, 2004 on Capitol Hill in Washington, DC. All three Senate office buildings were closed after deadly poison ricin was found at majority leader Bill Frist's (R-TN) office. (Photo by Alex Wong/Getty Images)
WASHINGTON - FEBRUARY 4: A man walks out of a Enviromental Protection Agency (EPA) command center in a Senate parking lot near the Dirksen Senate Building February 4, 2004 in Washington DC. Three Senate office buildings are closed after a letter was confirmed to contain the poison ricin in the Senate Majority leader Bill Frist (R-TN) office. (Photo by Mark Wilson/Getty Images)
Hazmat crews enter the Postal Facility (from the loading dock area) in the 3000 block of 'V' st. NE today after it was shut down. This facility processes U.S. Government mail including letters bound for the Senate. The letter with the ricin substance sent to Sen. Frist is believed to have gone thru this facility. Note the supplies being carried include duct tape and plastic baggies, etc. (Photo by Michael Williamson/The Washington Post/Getty Images)
A police patrol car blocks the entrance to Crumpsall Lane in Manchester Wednesday, where detective constable Stephen Oake, 40, was stabbed to death during a raid on terrorist suspects linked to the discovery in London of the deadly poison ricin. * Mr Oake, a father-of-three from Poynton in Cheshire, who served with the forces's Special Branch, died at North Manchester General Hospital after receiving emergency treatment at the scene. (Photo by Phil Noble - PA Images/PA Images via Getty Images)
Police officers in protective clothing guard the entrance to a house in Crumpsall Lane in Manchester, where detective constable Stephen Oake, 40, was stabbed to death during a raid on terrorist suspects linked to the discovery in London of the deadly poison ricin. * Mr Oake, a father-of-three from Poynton in Cheshire, who served with the forces's Special Branch, died at North Manchester General Hospital after receiving emergency treatment at the scene. (Photo by Phil Noble - PA Images/PA Images via Getty Images)
Irvine��Federal agents loaded a mysterious white powder substance found at the QuickStart company in Irvine into a US Customs Helicopter and flew the substance to San Diego for further testing. The Orange County Fire Authority tested the substance once as the biotoxin 'Ricin' and then later said it was not, so the FBI stepped in and led the investigation. (Photo by Mark Boster/Los Angeles Times via Getty Images)
Bulgarian defector Georgi Markov, a broadcaster for the BBC overseas sercvice, who was murdered. Assistant Commissioner Gilbert Kelland said a link had been found between the 'poison brolly' case and an injury in Paris to another Bulgarian exile. 07/01/03 Bulgarian defector Georgi Markov, a broadcaster for the BBC overseas service, who was murdered when a tiny 'bullet' filled with the poison ricin was fired at him from an umbrella as he walked September 1978 over London's Waterloo Bridge. Scotland Yard confirmed, that anti-terrorist detectives in London are questioning six men of north African origin after traces of the deadly poison ricin were discovered. (Photo by PA Images via Getty Images)
Defendant Cheng Le is shown in this government evidence photo which was released by U.S. Attorney's Office in Manhattan, during Le's trial in New York August 25, 2015. Cheng Le, 22, had in 2014 asked a Federal Bureau of Investigation analyst posing as a vendor on a website called Evolution to sell him ricin in the form of "simple and easy death pills" that he could resell, prosecutor Andrew Beaty told jurors in Manhattan federal court. REUTERS/U.S. Attorney's Office/Handout FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS
22-year-old Steven Michael Ekberg of Ocala, Florida is shown in a Marion County Sheriff's Office booking photo after he was arrested by the FBI, on January 12, 2005. Police found the biotoxin ricin in his possession in the home he shares with his mother. He is being charged with possession of a biological weapon. REUTERS/Handout-Marion County Sheriffs Office JLS/GN
Two criminal technicians prepare to enter the Danish embassy to get a suspicious letter and white powder in Stockholm. Two criminal technicians prepare to enter the Danish embassy to get a suspicious letter and white powder in Stockholm May 10, 2005. A large area was sealed off and a large rescue and police force was called to the Danish embassy in central Stockholm after one of the embassy workers found a letter with suspicious white powder on the second floor of the embassy. "We acted following our routines regarding ricin contamination," says the officer-in-charge. The white powder and letter will undergo tests at the Swedish Criminal Technology Laboratory. DENMARK OUT SWEDEN OUT NORWAY OUT NO THIRD PARTY SALES REUTERS/Bjorn Larsson Ask/Scanpix
Two technicians leave the Danish embassy with a suspicious letter containing white powder stored in a canister in Stockholm May 10, 2005. A large area was sealed off and a large rescue and police force was called to the Danish Embassy in central Stockholm after one of the embassy workers found a letter with suspicious white powder on the second floor of the embassy. "We acted following our routines regarding ricin contamination," says the officer-in-charge. The white powder and letter will undergo tests at the Swedish Criminal Technology Laboratory. ENMARK OUT SWEDEN OUT NORWAY OUT NO THIRD PARTY SALES REUTERS/Scanpix/Bjorn Larsson Ask jn/CCK/YH
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They were turned over to the FBI for further analysis. The official spoke on condition of anonymity because the official wasn't authorized to speak publicly ahead of FBI release of its findings.

Neither envelope entered the Pentagon. The mail screening facility is on the Pentagon grounds but separate from the main building.

Pentagon spokesman Chris Sherwood said the envelopes had been found on Monday.

Another Pentagon spokesman, Col. Rob Manning, said all U.S. Postal Service mail received at the screening facility on Monday was under quarantine and "poses no threat to Pentagon personnel."

Ricin is part of the waste "mash" produced when castor oil is made. According to the Centers for Disease Control and Prevention, if it is made into a partially purified material or refined, ricin can be used as a weapon capable of causing death under certain circumstances.

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