thank you for talking to al jazeera, alastair bolton >>> u.n. secretary-general ban ki-moon says north korea has withdrawn an invitation for him to enter the country, he would have been the first chief to enter in more than 20 years. he was due to go to a complex of the factories inside north korea, that is jointly run with the south >>> to perunity where police fired tear gas to stop demonstrators. they want the president to abandon his attempt to stand for office, and is trying to tighten his grip on power. we have this report from the capital. >> reporter: even though warned not to go out. they are doing so. there are police not letting them mark into the central distribute of the capital. tear gas is fired, people run for cover. police don't want this shown on television. especially when they make processes clear the road. in another part of bujumbura, others are on the street. they seem defiant. >> we will demonstrate the power, yes. >> reporter: government officials say some protesters are armed and dangerous and were involved in the faile