Six days of rioting around a central city in Burma prompted authorities Friday to declare a state of emergency and place the area under martial law to prevent a fresh outbreak of disturbances next week.

Burma's Council of States issued the order Friday night amid a State Department warning to Americans traveling to the Southeast Asian country to use "extreme caution" and warned of more violence on Monday, a Moslem religious holiday.The Moslem holiday is followed by the beginning of Buddhism's Lent in Burma on Thursday. About 87 percent of Burma's nearly 40 million people are Buddhists while Moslems form a small minority.