A police incident has closed Interstate 91 in Vermont, near the border with Canada, on Monday afternoon, state police said. The nature of the police incident, with Vermont State Police called “evolving” in a statement,

The federal officer killed while on duty near the Canadian border has been identified as a U.S. Air Force veteran who provided security at the Pentagon during the Sept. 11 attacks.

David Maland, 44, was a military veteran who worked security duty at the Pentagon during the Sept. 11 attacks, his family said.