"At this time, foul play is not suspected," Banyai said Tuesday night. Investigators are working to determine whether the vehicle had any defects or whether alcohol was involved, he said.
Authorities had been searching since late Sunday night for Kyrstin Gemar, 22, of San Diego; Afton Williamson, 20, of Lake Elsinore, Calif.; and Ashley Neufeld, 21, of Brandon, Manitoba.
The Dickinson State University students were believed to be in the white 1997 Jeep Cherokee with California plates when two of their friends received telephone calls before the lines went dead. Police described the first as a "very scratchy" call for help in which one of the women said they were near a lake and water.
Banyai said the pond where the women were found is a couple miles off a road on a farm northwest of Dickinson, a city of 16,000 people about 100 miles west of Bismarck and 60 miles east of the Montana state line.
He said "pings" -- signals sent from a cell phone to a provider tower, or vice versa -- from the women's phone calls helped narrow the search area. Searchers on foot found vehicle tracks leading into the pond Tuesday afternoon.
"After that was located, the plane flew over the top and it could see that there was a white object in the water," Banyai said. The submerged vehicle was pulled from the pond about two hours later.
Kyrstin Gemar's parents, Lenny and Claire, said during an earlier news conference at police headquarters, before the bodies were found, that they had talked to their daughter late Saturday night. Lenny Gemar said it was not uncommon for his daughter and her friends to go stargazing on the spur of the moment.
The women's families were not at the news conference where police announced the deaths.
Students at Dickinson State, where the women were stars on the school's softball team, led a prayer service Monday night that drew more than 300 people. Another service was scheduled at the 2,700-student school for Tuesday night.
"We are very deeply saddened by this turn of events and we are going to mobilize all of our resources to work with the families and the students on campus," Dickinson State spokeswoman Constance Walter said. "They will be greatly missed by their teammates and others."
The college listed Gemar as a senior business major who played third base on the softball team. Neufeld was a senior outfielder working on a degree in psychology, and Williamson, a junior, was a pitcher majoring in psychology with a minor in coaching.
Gov. John Hoeven issued a statement extending sympathy to the families and appreciation to those who participated in the search, "which ended in a way we all prayed it wouldn't."
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