BOULDER, Colorado (CNN) -- The parents of slain child beauty queen JonBenet Ramsey are being questioned again this week by investigators looking into her murder, sources confirmed Wednesday for CNN.

John and Patsy Ramsey have been interviewed several times over the last several days at a secret location by investigators for Boulder County District Attorney Alex Hunter, the sources said.

The Ramseys, who now live in Atlanta, were last interviewed by investigators in April 1997. Denver television station KUSA reported the questioning was taking place somewhere in the Denver metropolitan area outside of Boulder. More interviews are planned for this week, KUSA reported.

Six-year-old JonBenet was found beaten and strangled in the basement of the family's Boulder mansion on December 26, 1996, hours after Patsy Ramsey says she found a note from a kidnapper demanding a ransom for the girl's return.

Early in the probe, police described the parents as possible suspects in their daughter's murder, but no charges have ever been filed. The Ramseys have strongly denied having anything to do with their daughter's death.

Since their last interview nearly 15 months ago, the Ramseys have refused to submit to further questioning by Boulder police unless they were allowed to review evidence in the case. They did, however, say they would be willing to talk with investigators from the district attorney's office.

Earlier this month, police spent two days presenting their case to Hunter and his team of investigators, requesting that he convene a grand jury. A grand jury could subpoena witnesses to testify and return indictments in the case.

Lack of cooperation from the Ramseys was one of the reasons police gave for asking Hunter to turn the case over to a grand jury.

Investigators recently said JonBenet's parents were still under the umbrella of suspicion and that the umbrella was getting smaller.

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