Travelers at Raleigh-Durham International Airport are enduring long security lines Monday morning hours after Terminal 1 was evacuated due to an anonymous threat.

The threat was made just before 4:30 a.m., leading to the evacuation, according to a spokesperson from RDU. Hundreds of people waited outside for just over an hour before the all-clear for RDU employees to reenter the building just before 6 a.m. 

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"Law enforcement checked and cleared the facility, which reopened at approximately 6 a.m." an RDU spokesperson said. "We continue to monitor the situation and maintain a law enforcement presence at the airport for the safety of all our guests and employees."

Sky 5 flew over the terminal at 6 a.m. showing a long line of people waiting to go back inside.  At 8 a.m., the main security line was so long that some people were worried they would miss their flights.

Passengers described the evacuation, telling WRAL they were told to leave the airport and get as far away as possible.

Stephanie Necak said her flight was 10 minutes from boarding when security came through and evacuated the terminal.

Rosalind Williams told WRAL News she was already on a plane when the building was evacuated, but she was also told to leave.

"They announced that we needed to get off ... leave your bags, get off the plane," she said.