WASHINGTON (AP) - Attorneys in the 2001 Chandra Levy murder case will be back in court for another hearing, the substance of which will be kept from the public and the news media.

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Although observers will be allowed into the courtroom, Thursday's proceedings will be conducted at the bench, with a white-noise machine that prevents observers from listening to what is said.

The hearings have been held behind closed doors over the last several weeks and could signal a problem with the prosecution. Ingmar Guandique, an illegal immigrant from El Salvador, was convicted of Levy's murder in 2010 and is serving a 60-year prison sentence.

Levy was a Washington intern whose murder went unsolved for years and captivated the public because of her romantic relationship with a California congressman.