UPDATE: (06/09/15) 1:48 p.m. Reporters have been allowed back into the briefing room after bomb sniffing dogs swept the area. Reports indicated the room was cleared due to a bomb threat. The nature of how the threat was delivered is unknown at this time.

WASHINGTON (AP) — Part of the White House has been evacuated amid security concerns.

Secret Service officers interrupted a live, televised press briefing with the White House press secretary on Tuesday and evacuated the James S. Brady Briefing Room shortly after 2 p.m. The officers would not say what prompted the evacuation, and the White House had no immediate information about the incident.

Reporters were escorted to a driveway separating the West Wing from the neighboring office building. White House officials could be seen continuing to enter and depart the West Wing through a side door.

Evacuations at the White House are rare but not unprecedented.