Nov. 12, 2010 -- Ohio police are searching for four missing people, including two children, whose alarming disappearance prompted an Ohio college to go on lockdown overnight as police warned of a "potentially dangerous person in the vicinity."
Tina Herrmann, 32, was reported missing by her boyfriend Wednesday. When she did not show up for work at a Dairy Queen Thursday, her co-workers went to her home looking for her and soon after called the police, Knox County Sheriff David Barber told WBNS-TV.
"Thursday, Tina did not show up at work; she works at the local Dairy Queen in Mount Vernon," Barber said. "A co-worker came out and met deputies out here. Her truck was gone."
Also missing are Herrmann's two children, 13-year-old Sarah Maynard and 10-year-old Kody Maynard, as well as a friend, Stephanie Sprang, 41. "When [Herrmann's co-worker] went in, she saw some things out of place," the sheriff told WBNS.
He said a search of the home revealed it to be in "unusual condition" for a place where woman and children lived, but did not specify what that meant.
Herrmann's ex-husband Larry Maynard told WBNS-TV that a co-worker went inside the home and saw blood and things out of place before calling police.
Barber and other sheriff's deputies would not comment to ABCNews.com.
Herrmann's boyfriend Greg Borders told the Columbus Dispatch that the couple lived together but were in process of breaking up. He last said he last heard from her Wednesday via text message.
"We were both going to go our separate ways," he told the paper"We were fairly civil, as civil as you can be living in the same house when you're broken up."
A spokesman for the FBI field office in Cincinnati said the agency was aware of the incident, but could not comment on whether it would cooperate in the investigation.
Spring's car was found outside Herrmann's home Thursday. Herrmann's pickup truck was at the home Wednesday when the boyfriend reported her missing, Barber said, but it was found abandoned Thursday night at nearby Kenyon College.
Police alerted the college that they believed the car may have been left there by a person involved in the group's disappearance.
The college sent out an e-mail to students Thursday night, alerting them that "local law enforcement advised of a potentially dangerous person in the vicinity."
A spokesman for the college, however, told the Associated Press that the lockdown was purely precautionary and administrators did not believe students were ever at risk. The lockdown was lifted at 7 o'clock this morning.