The U.S. Capitol Police found a letter with “concerning language” near the office of Congressman Bennie Thompson, D-Miss., on Tuesday.
According to NBC, authorities initially responded to reports of a suspicious powder or substance. Capitol Police later released a statement saying the letter had been screened and it was determined that nothing dangerous was inside.
“Our investigators take all concerning statements and threats seriously and threats seriously,” the Capitol Police said in a Twitter post. “They are now working to determine who sent the letter and why.”
The incident comes amid a series of hearings, led by Thompson, in which lawmakers are investigating the January 6 attack on the U.S. Capitol.