OSLO - Norwegian authorities on Friday presented details of an alleged plot to decapitate the Israeli ambassador to Oslo and blow up the Israeli and American embassies in the city. The four suspects, three of them of Muslim background, are also charged with firing at the city's synagogue last week, causing damage but no injuries. The evidence against the suspects was revealed in the course of extending the suspects' remand, and is based on recordings of their conversations obtained by bugging devices placed in the lead suspect's car.