A Palestinian Christian activist who had received repeated death threats was found stabbed to death in a street in Gaza City early Sunday. Rami Khader Ayyad, 32, was director of the Teacher's Bookshop, Gaza's only Christian bookstore, which is run by the Bible Society of Gaza Baptist church. Health Ministry officials confirmed his death. Ayyad had been missing since Saturday evening. Over the years he had received repeated death threats from unidentified people displeased with his missionary work. The Interior Ministry run by Gaza's Hamas rulers condemned the killing and said it launched an investigation.