India, March 30 -- Terminal 1 at Raleigh-Durham International Airport (RDU) was evacuated during the early hours of Monday morning following an anonymous threat, reported CBS affiliate WNCN.

Law enforcement officials responded to the terminal, which remained evacuated while they conducted their probe. RDU stated that they received the threat at 4:20 a.m.

"Law enforcement and TSA officers are on site thoroughly checking the facility," the airport stated in a statement on Monday. "Safety is our top priority, and we ask that passengers please be patient as we work to return to normal operations."

A representative informed CBS 17 crews present at the location that the terminal had been shut down because of an "ongoing security concern."

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