WASHINGTON (AP) — The U.S. is calling on the Greek government to find and return to prison a member of a terrorist organization, which is responsible for the deaths of five employees of the U.S. mission in Athens.

Christodoulos Xiros (Chris-toh-DOO’-los SEER-ross), a far-left terrorist gunman serving six life sentences, vanished while on New Year’s leave from prison, prompting a nationwide manhunt.