Prosecutors on Friday urged a court to convict Mohammed Ali Hamadi in the hijacking of a TWA jet and slaying of a U.S. sailor, and they demanded the harshest sentence possible: life in prison.

The prosecutors' closing statement, coming nearly 10 months after the trial began, said Hamadi's actions "violated the foundations of civilization."Hamadi, a Lebanese Shiite Moslem, is charged with murder and air piracy in the June 14, 1985, hijacking of the Athens-to-Rome flight. Navy diver Robert Stethem was killed and 39 Americans were held hostage 17 days.