Authorities are seeking the public’s help to close an 18-year-old cold case involving a double homicide and two missing Oklahoma teenagers, KFOR-TV reports.

The Oklahoma State Bureau of Investigation is offering a $10,000 reward for whoever provides credible information about the case.

Between Dec. 30 and 31, 1999, the home of Danny and Kathy Freeman burned down and their bodies were discovered inside. Investigators believe the two were shot and killed before the house was set ablaze.

The Freeman’s daughter, Ashley, and her friend Lauria Bible subsequently went missing. Bible had been staying at the home to celebrate Ashley’s birthday.

Both were 16 at the time.

Investigators are hoping for new leads to help crack the cold case. Authorities say they have conducted interviews with multiple people who may have knowledge about the double homicide and missing teens, including at least one interview within a prison, according to the Tulsa World.

Police also have searched areas of interest, such as an abandoned well in 2016 that was owned by a convicted murderer. All that was found was an old bucket, the newspaper reports.

Craig County Sheriff Heath Winfrey has provided detectives with records recently discovered from case files left from previous sheriffs.

“Those notes and documents have proven extremely valuable. The investigation now has a definite course and direction,” a news release from the sheriff’s office says.

Still, authorities believe there are more people out there who have information that may help put the investigation to rest.

Aside from the $10,000 reward from the Oklahoma State Bureau of Investigation, a private reward of $50,000 also is being offered.

To report information about the case, call police at 1-800-522-8017 or email tips@osbi.ok.gov.

[Feature Photo: Ashley Freeman (l) and Lauria Bible (r)/National Center for Missing and Exploited Children]