Peruvian prison officials are denying a claim that convicted killer Joran van der Sloot was stabbed in the highlands prison where he was recently transferred.

A prisons official said Monday that Van der Sloot has two superficial wounds on his abdomen that were probably self-inflicted. The official, who was not authorized to talk to the press and spoke on condition of anonymity, said he has been held in isolation from other prisoners in the Challapalca prison.

The Peruvian woman whom Van der Sloot married in June told reporters Sunday that he had been stabbed but presented no evidence. His attorney, Maximo Altez, made the same claim Monday.

Van der Sloot, in prison in Peru, remains the prime suspect in the 2005 disappearance of the U.S. teen Natalee Holloway in Aruba.