It was a .40-caliber Glock.

In their latest effort to solve a double-murder that thus far has neither motive nor suspects, Oklahoma police have revealed the make of one of the weapons used to kill two young girls on a country road nearly 10 weeks ago.

Police say two guns were used to kill 13-year-old Taylor Paschal-Placker and 11-year-old Skyla Jade Whitaker as they took an afternoon walk down County Line Road in Okfuskee County on June 8. It's a "brutal and deliberate" crime that has stymied investigators in this rural area 70 miles south of Tulsa.

"Since we don't have a motive, we just can't look in one direction for a certain person," Jessica Brown, spokeswoman for the Oklahoma State Bureau of Investigation, told FOXNews.com. "It's wide open."

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In a state that doesn't require gun registration, officials have had to canvas local pawn shops to check sales records for Glocks. They compiled a list of 60 gun owners and tested the weapons of about 40 last weekend. But they still need to test more.

"Here's the only way it's going to help us probably, if someone just bought a gun or they loaned it to someone recently right before the homicides and got it back," Brown said.

Officials said they were checking up with the remaining 20 gun owners to see why they chose not to have their weapons tested. "We just want people to cooperate so we can find this weapon, and then the person who had it in his hand," Brown said.

Whoever shot the girls was thorough. The state Medical Examiner's office found Whitaker had eight wounds to the arms, chest, abdomen and neck, and Paschal-Placker had five gunshot wounds to the head, groin and hand.

The girls were best friends; they were killed as they walked down to a bridge for exercise during a sleepover weekend. Authorities suspect the killers live in the area, and that has the county's 11,250 residents living in fear.

At the girls' school, classes are on lockdown throughout the school day, and the small school body is down by about 10 students.

"We’ve really tightened up our security here," Wanda Mankin, the elementary principal of Graham School, said.

Students, who have been offered professional counseling, were given green and purple bracelets that read "In Memory of Taylor and Skyla B.F.F." when school started on Aug. 7. The colors were the girls' favorites.

"One of our bus routes used to go by the crime scene, and we rerouted the bus even though it takes a little longer and a little more fuel," Mankin said. "We don’t go by there anymore."

Investigators have been searching for a "person of interest" in the case since mid-June. Described as a 6-foot American Indian, about 35, with long black hair, he was seen driving a white Ford or Chevy single-cab pickup truck on County Line Road around the time of the shooting.

Indian activists have said they aren't surprised police haven't been able to find him.

"That could be any Indian in Oklahoma," said Brenda Golden, an activist originally from Weleetka.

Authorities say the description is all they have to go on.

"There’s nothing we can do about that," Brown said. "That’s exactly what the multiple witnesses told us. We asked them to get more specific, of course, and that’s the best they could do."

Golden, who now lives in Oklahoma City, said the fear of police persecution is one reason the large Indian community isn't talking.

"We're not going to get treated fairly," she said shortly after the murders. "Automatically people are assuming that this Indian did something wrong just because he was in the vicinity."

Police stress the Indian is not a suspect.

"He was just seen in the area close to the time the girls were shot and killed," Brown said. "That is such a remote area that that stood out to us."

Late last month, investigators released the tape of Taylor's grandmother calling 911 in an effort to warm a cooling trail of leads. Brown said it gave investigators good tips, but still, no arrests.

"This is unusual, but we have many cases where it's a whodunit that we have to go to the public to ask for help," Brown said.

In this case, all investigators have had to go on is a rural crime scene, the bullet-riddled bodies of two little girls and an inkling that these friends may have stumbled upon someone doing something so bad it led to murder.

"When it all finally comes together, I hope we’re wrong," Mankin said. "I do hope it's not someone who lives here among us."