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.

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.

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