YANGON (AFP) - Myanmar's regime Wednesday told pro-democracy leader Aung San Suu Kyi to halt all political activities and warned her that plans for a national political tour could spark riots and chaos. Official media said the home affairs ministry had written to the Nobel Peace Prize winner, who spent most of the past two decades locked up at the hands of the junta, stating that her party's activities had already broken the law. It is the first time since her release last year that the authorities have explicitly warned Suu Kyi to stay out of politics. Her immediate response indicated she had no intention of cancelling the planned tour indefinitely.