Niger opposition figure arrested after returning from exile

By Abdoulaye Massalaki NIAMEY (Reuters) - Niger opposition leader Hama Amadou was arrested when he flew in to the capital on Saturday as security forces blocked off the airport, a year after he fled the country when sought by investigators probing a child trafficking ring. Hama, a former speaker of the national assembly and ally of President Mahamadou Issoufou, had pledged in September to return to Niger to stand in a presidential election next February. Last year he left the country before inve