YANGON, Sept 19 (Reuters) - Myanmar's military junta said on Wednesday it had used tear gas and fired warning shots to disperse a crowd of 1,000 Buddhist monks and civilians protesting in the northwestern coastal city of Sittwe. State-owned MRTV and official newspapers said one civilian official and nine policemen were injured in Tuesday's protests, sparked by calls for a nationwide boycott by Buddhist monks of members of the ruling junta and their families. The papers said no protesters were injured or detained, countering witness reports of three or four monks being hit and slapped while being arrested.