Investigators handling the disappearance of Olivia Lone Bear are interviewing and re-interviewing people recorded on a video with the woman, who was last seen Oct. 24.
Three Affiliated Tribes Police Detective Sam Lincoln said there is one man in particular that he would like to talk with again.
"We talked to him on the phone late last week, but there’s some information that’s been brought to light so we want to visit with this individual in person and go through some detailed information," he said, declining to elaborate.
Authorities also will interview Lone Bear's family, according to Lincoln.
"We’ve kind of come to an impasse here so now it’s time to restrategize," Lincoln said after last weekend's search for Lone Bear and a meeting of agencies on Monday.
Matthew Lone Bear said as many as 35 people turned out Saturday and Sunday to search for his sister. Fire departments from Belcourt, Beulah and New Town aided the search, as well as surrounding sheriffs' departments.
Investigators are attempting to fly a drone but clouds have hampered such efforts, Lincoln said.
Volunteers met twice daily at 8:30 a.m. and 5 p.m. for safety orientation at the MHA and TERO Energy Complex building at 305 Fourth Ave. near Four Bears Casino.
Matthew Lone Bear said flyers throughout western North Dakota have helped get the word out about his sister. He asks Bakken region landowners to check their property, too.
"The more eyes we have on this, the better it’s going to be," he said. "That’s why we have such a wide area we’re searching."
Lincoln said last week that efforts were focused on the reservation —almost 1 million acres in area, larger than the state of Rhode Island.
"We're still after it," he said.
A Facebook page, Searching for Olivia Lone Bear, has been activated to provide information on the search.
A PayPal fund began last weekend for gasoline and food for volunteers, at email@example.com.
"The Bakken is a big place," Matthew Lone Bear said.
Olivia Keri Lone Bear, 32, of New Town, was last seen around 6 p.m. Oct. 24 leaving Ranchman's 23 Saloon and Steakhouse at New Town, driving a teal 2011 Chevrolet Silverado 2500 with an extended cab and silver toolbox and North Dakota plate 839 BRC.
She is Native American, 5 feet, 6 inches tall, weighs 130 pounds and has brown hair and brown eyes. She has scars on her right front shoulder and one of her palms. She also has several tattoos and pierced ears.
Anyone with information may contact a tip line at 701-627-6141 from 8 a.m. to 6 p.m. or call 701-627-3617 outside of those hours or on weekends.