Two vehicles of interest were announced on Monday in the search for Jayme Closs, the Wisconsin teenager who went missing October 15.
Police discovered the bodies of the couple when they arrived at the residence, but there were no signs of Jayme, prompting them to issue an AMBER Alert for the missing teenager.
Elizabeth Smart - the woman who was kidnapped from her parents' home as a teenager in 2002 - has joined the appeal for missing Jayme Closs.
Investigators believe a red or orange Dodge Challenger made between the years 2008 and 2014 might be linked to the incident. He said the second vehicle is either a 2006 to 2010 Ford Edge or a 2004 to 2010 Acura MDX, both black.
Chris Fitzgerald, the sheriff of Barron County, where Jayme went missing, also appealed for information on Friday.
Authorities on Monday called for 2,000 volunteers to help in a ground search for clues in the disappearance of a Wisconsin girl whose parents were gunned down in their home last week.
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Kovac was unable to work with his players over the break and had been hoping they would get a "clear head" while on global duty. It is said to be causing unrest within the club and team and a debate about the future of new coach Niko Kovac .
The volunteers must be able to walk on uneven terrain, the Barron County Sheriff's Department said Monday.
Barron County Sheriff Chris Fitzgerald speaks during a press conference about 13-year-old Jayme Closs. He said both were shot to death. When the dispatcher called the number back, a voicemail greeting indicated that the phone belonged to Denise Closs.
Sheriff Fitzgerald said Saturday that investigators have received more than 1,000 tips and have investigated more than 800 of them.
The door had been kicked in.
'If you spent time with members of the Closs family recently or if you have ever had a misunderstanding with any members of the Closs family or know someone who has, please call the tip line, ' he said.
The Barron Area School District will hold "A Gathering of Hope" Monday evening at Riverview Middle School, where CNN affiliate WCCO-TV says Jayme was a dancer and cross-country runner.