Barron County Sheriff Chris Fitzgerald is now asking for 2,000 able-bodied volunteers to help conduct an expanded search for evidence Tuesday.
Fitzgerald did not have license plate numbers for the vehicles.
State, local and federal investigators have been searching for Jayme since around 1 a.m. on October 15. On Oct. 15, an AMBER Alert was issued, and later, she was added to the FBI's list of missing and kidnapped people, adding a new photo of the girl. A search involving 100 volunteers combed the area near the family's home on Thursday but found nothing. They'll be looking along Highway 25.
In the week since she vanished, over 1,200 tips have been submitted, the sheriff's office said. The sheriff hopes to be completed with searching at 4 p.m. Volunteers must be 18 years or older and present a picture form of identification. The agency began posting information about the teen on digital billboards around the country.
A search for an "endangered" missing girl, whose parents were found shot dead in their home in the USA state of Wisconsin, has expanded nationwide as police struggle to find clues to her whereabouts.
Her grandfather, Robert Naiberg, 72, said his daughter Denise and Jayme attended a party the weekend before the murders, and that his son-in-law, James Closs, was working and couldn't make it.More news: U.S. shows double standard on Khasoogi disappearance: Russian envoy
More news: Cowboys trading for Raiders WR Amari Cooper
More news: Paul Manafort 's sentencing for fraud is set for February
Recently released 911 dispatch logs show multiple shots were fired at the Closs home in the early morning hours of Monday, Oct. 15.
The dispatcher "could hear a lot of yelling" during the 911 call.
He said when the deputies arrived at the house, James was found dead at the door.
Volunteers and law enforcement combed the sides of United States 8 - the road where the Closs' home is located - on Thursday, looking for evidence.
Sheriff Fitzgerald says Jayme is not considered a suspect in the killings. There will be music, resources for families, and spiritual and emotional care.