Authorities responded Monday to a threat against Sen. Michael Bennet's (D-Colo.) Denver office, Bennet's spokesman said.

The FBI and U.S. Capitol Police arrested an individual suspected of making a threat to the Colorado Democrat's state office, said Adam Bozzi, the senator's communications director.

"We can confirm that there was a threat against Senator Bennet’s office and that the FBI is working with the Capitol Police to have arrested the individual responsible for the threat," Bozzi said in a statement.

"Michael has full confidence in the law enforcement agencies handling the case and remains focused on his job serving the people of Colorado," Bozzi added.

The threat comes at a point of heightened sensitivity for lawmakers, following the attack on Rep. Gabrielle Giffords (D-Ariz.) at an event Saturday in Tucson. Capitol Police also responded Monday morning to a report of a suspicious package at a D.C. Metro stop near the Capitol.