A man believed to have started a fire in a garden at a synagogue in the east of Tunisia is in custody and under investigation for targeting a Jewish house of worship, officials said Saturday. Hichem ben Ayad, the public prosecutor in the eastern port city of Sfax, told The Associated Press that a garden in the courtyard of the city’s synagogue was set on fire on Sunday. An investigation was opened and a suspect was arrested, he said. The suspect is a man in his late 40s who has worked as a public official, ben Ayad said. The man is being questioned to establish if the fire — which the prosecut…