Volunteers and sheriff's deputies joined the FBI in scouring parts of Knox County on Saturday in hopes of finding two women and two children who disappeared this week.
Tina Herrmann, 32 , her children Sarah Maynard, 13, and Kody Maynard, 11, were last seen on Wednesday, 10TV News reported.
Herrmann's friend, Stephanie Sprang, 41, also disappeared.
Volunteers started their day outside with prayer outside nearby Kenyon College, in Gambier. Then, they searched an open field where Herrmann's pickup was found late Thursday night, 10TV's Tanisha Mallett reported.
An Ohio State Highway Patrol airplane searched from the air and Ohio Department of Natural Resources teams searched nearby Apple Valley Lake.
"I kind of want to know what is going on because it is so close to home," said Amanda Strouse of Mount Vernon. "I mean, four people missing, that's kind of scary."
Knox County Sheriff David Barber asked everyone to keep a guarded, but optimistic attitude about how the case might unfold.
He said that evidence continues to be collected and processed; with special attention being paid to blood that was found inside Herrmann's home. Barber called the amount of blood "unusual."
"It is obvious that someone was injured in the house," Barber said.
Dozens of friends and loved ones gathered at a vigil on Saturday night to pay tribute to the missing people, 10TV's Jason Frazer reported.
The vigil was held at the Amity-Apple Valley Baptist Church, where Kody Maynard attended services several times, according to friends.
Church members said that they were praying not only for the safe return of the missing people, but for the investigators to find them.
"It's a family-oriented community where everyone watches out for each other," said Pastor Todd Miller. "It has taken us by surprise by what happened."
Miller said that he was not surprised by the outpouring of support in finding all four victims.
No one has seen or heard from the missing women or children since Wednesday, when Herrmann failed to show up for work.
On Thursday, both of her children were absent from school.
Sarah M. Maynard is 5 feet tall, weighing 90 pounds, with blonde hair and green eyes.
Kody A. Maynard was described as 4 feet, 10 inches tall, weighing 70 pounds, with brown hair and hazel eyes.
Sprang is 5 feet, 3 inches tall, weighing 110 pounds, with blonde hair and green eyes.
Herrmann was described as 5 feet, 6 inches tall, weighing 122 pounds, with sandy blonde hair and blue eyes.
Anyone with information about the case is asked to contact the Knox County Sheriff's Office at 740-397-3333.
Stay with 10TV News and refresh 10TV.com for continuing coverage.
November 13, 2010:
Support Growing To Find Missing Family, Friend
November 12, 2010: Search Continues For Missing Women, Children
November 12, 2010: 4 Missing From Knox Co.; Discovery Of Pickup Prompts Kenyon College Lockdown