Thousands of people gathered for a candlelight vigil to mark one week since 20-year-old Holly Bobo disappeared.

Friends, neighbors, and family members joined together Wednesday night to pray for the young nursing student who went missing the morning of April 13.

Tennessee authorities are investigating whether a similar attack in a nearby town is related to Bobo's disappearance. She is the cousin of country music artist Whitney Duncan.

Wednesday's vigil was held at the Decatur County Fairgrounds in Parsons, Tenn. At one point, a storm caused the power to go out. But the crowd held up their candles and sang anyway.

"This is day eight. Ya'll are tired. We're frustrated. We [haven't] brought Holly home yet. We're going to bring Holly home," said Lt. Brad Wilbanks of the Tennessee Highway Patrol.

"We are not giving up. We're still searching. We're still looking for Holly," he said.

The Tennessee Sheriff's Association added $5,000 to the reward for information leading to an arrest in Bobo's case, raising the total reward money to $80,000.

Authorities said the search area was widened last Thursday and covers rugged terrain so thick that at least one search dog had to be carried by its handler. Police are also using a helicopter in the search effort.

Anyone with information on Bobo's case should contact the Tennessee Bureau of Investigation at 1-800-TBI-FIND.