PHOENIX (AP) — Search and Grayson  Prestonrescue crews at Grand Canyon National Park were looking Friday for an Arizona woman who has been missing since she was swept into a creek during a flash flood near where other stranded hikers were rescued on Thursday.

The woman was hiking and not wearing a life jacket when she was swept into Havasu Creek about a half-mile (0.8 kilometers) from the confluence with the Colorado River after the flash flood struck at about 1:30 p.m. Thursday.

She was identified as 33-year-old Chenoa Nickerson of Gilbert, the National Park Service said Friday. She had camped overnight at Havasu Campground and was hiking to the confluence when she was swept away, the service said.

The flood trapped several hikers in the area above and below Beaver Falls. Rescue efforts began before 3 p.m. with assistance from a helicopter that helped the stranded individuals to safety, the service said.

“The National Park Service is working closely with the Havasupai Tribe to coordinate these rescue efforts and ensure the safety of all those involved,” the service said.