tripoli libya coastal guard rescue 250 illegal migrants try leave north african country small boat bind italy officials say saturday libya western shore main departure point migrants mainly sub-saharan countries flee poverty conflict try reach europe arrivals italy fall two-thirds since july period last year officials work u.n.-backed government tripoli italy partner manage cut back human smuggle city sabratha west capital push trade east coast guard intercept several boat coast near qaraboulli zliten two towns locate east tripoli naval force ibn ouf vessel rescue friday illegal migrants include women children men ... different sub-saharan arab countries coast guard captain abdulhadi fakhal tell reuters rescue qaraboulli zliten towns ... 250 270 persons fakhal say libya plunge chaos since 2011 overthrow muammar gaddafi nato-backed uprise u.n.-backed government national accord tripoli try gain control territory libyan coast guard rescue 250 migrants try reach italy