Campus Reform reporters have been investigating the University of Maryland’s connections to the National Security Agency.

They have posted video featuring an exchange with campus police:

University of Maryland (UMD) police on Wednesday prohibited two Campus Reform reporters from filming an alleged covert government facility where Edward Snowden is believed to have worked as a security guard in 2005.

Sergeant Aaron Davis, spokesperson for the UMD Police Department, told Campus Reform on Wednesday that his officers were acting at the direction of  “NSA security” officials.

“We respond to them,” he told Campus Reform.

In a separate incident on Thursday, two other Campus Reform reporters were briefly detained on the public road outside the facility and required to provide identification to officers as a condition of remaining in the public area adjacent the building’s grounds.

“Do you guys have your ID on you?” officer Minkyu Pak asked Campus Reform reporter Timothy Dionisopoulous.

“Am I obligated to give it to you?” responded Dionisopoulous.

“Yeah if you don’t give your ID… [inaudible] you have to leave the area,” said officer Pak. “So if you don’t want to give me your ID, you have to leave.”

In the Wednesday incident, however, UMD police banned Campus Reform reporter Katherine Timpf and contributor Spencer Schredder from filming on the public road outside the building.

“Don’t film this direction,” an unidentified officer wearing a bulletproof vest who was accompanied by another unidentified officer in a suit, told Timpf.

“You cannot film the area,” Officer “Walker” of the University of Maryland Police Department said several minutes later. “[Y]ou have nothing more to do here except leave.”

Sergeant Davis told Campus Reform later in the day that he was not aware of any laws or ordinances the reporters may have violated by photographing the building, adding his team was simply following the directions of “NSA security.”