Spies are known for being cloaked in mystery, and now mystery has also clouded the fate of a memorial stone for legendary Israeli spy Eli Cohen in Haifa, reports Yediot Haifa. The large boulder, and a tree that was growing next to it, disappeared from the Eli Cohen memorial park in Kiryat Sprinzak recently, baffling and angering local residents. According to the report, commemorative signs in the park have already been stolen three times in as many months, But these thefts were quickly put down to scrap metal thieves. There were no obvious culprits, however, for the disappearance of the boulder and tree, and residents said they were puzzled and angry, blaming the municipality for long-running neglect of the park. But a municipal spokesman seemed surprised by the confusion. He said that the city had removed the boulder and the tree as part of renovation work being done at the park, and the boulder will be placed at a prominent traffic island in the city, "so that everyone can enjoy it." He also said the problematic metal signs would be replaced by a polystyrene/Styrofoam sign to deter metal thieves. He did not say what had happened to the tree. Cohen was a top Israeli spy who infiltrated Syria's leadership in the 1960s and sent important information back to Israel before his cover was blown. He was publicly hanged in Damascus in 1965.