A search was launched on Sunday to find a missing North Carolina woman last seen when she left her home to go running, WRAL.com reported.

Nancy Cooper, 34, reportedly went for a routine jog early Saturday morning, but never returned home to meet friends as planned.

Volunteers and police mobilized a search team with the help of the National Guard and police canines.

"We have had assistance from the National Guard that have flown routes for us in helicopters." Cary Police Capt. Michael Williams told WRAL.

Though Cooper's exact running route is unknown, volunteers reportedly scoured running trails and a golf course by foot and by bicycle — and plastered flyers with Cooper's picture on buildings and street signs.

"That was a little odd," neighbor Diana Duncan told WRAL upon learning of Cooper's disappearance. "She doesn't stand you up. She'll always call."

Authorities described Cooper — an avid runner who was training for a half-marathon — as a caucasian woman, approximately 5 feet 9 inches tall and weighing about 120 pounds. She has hazel eyes and brown hair, and was last seen wearing a T-shirt, running shorts and light blue running shoes, according to WRAL.com.

"She has two beautiful little girls who I love so much," Duncan said. "We her so much; we all do. We just have to keep looking on."

Click here for more on the story from WRAL.com.