Federal authorities investigate suspicious mailings sent to congressional and secretary of state offices

The FBI, U.S. Capitol Police and U.S. Postal Inspection Service are investigating letters containing suspicious substances that were mailed to “various addresses nationwide, including multiple Congressional offices,” according to a notice that senior staff in Senate offices received Thursday morning.

“Law enforcement officials are working to intercept any additional letters before they are delivered, however, it is possible that some letters may reach their destinations,” the notice said, according to two people who received it.

The offices of several Democratic senators were targeted, including Senate Minority Leader Chuck Schumer, D-N.Y., NBC News confirmed. Two law enforcement sources briefed on the matter confirmed that “dozens of letters” were sent, but because law enforcement continues to intercept the letters, they are declining to put an exact number on how many have been received or seized.

The notice included an image of one of the suspicious envelopes and said that the letters “may contain different variations of postage stamps.” It also warned that suspicious letters, packages or substances “should be treated as potentially hazardous and handled in accordance with established safety protocols.”

The notice outlined how staff should handle the items and noted that mail and packages delivered to Senate offices or the…

Original source: https://www.nbcnews.com/sports