Authorities said Monday they are investigating a burglary at a Donald Trump campaign office in suburban Virginia, circulating surveillance video of a man inside the building with what appears to be a full backpack.

The break-in was reported late Sunday at the campaign office in Ashburn, according to the Loudoun County Sheriff’s Office.

The building, in a suburban office park about 30 miles west of downtown Washington, also serves as the headquarters of the Virginia 10th District Republican Committee.

“It is rare to have the office of any political campaign or party broken into,” Sheriff Mike Chapman said in the statement. “We are determined to identify the suspect, investigate why it happened, and determine what may have been taken as well as what may have been left behind.”