tripoli libya european-backed coast guard saturday turn back 150 migrants try reach italy boat amid heighten efforts block cross mediterranean migrants pack single rubber boat intercept coast towns al khoms garabulli east tripoli travel night boat close italian coast guard ship patrol international water cut take aboard libyan vessel dash hop reach europe rubber boat rock heavy wave motor cut shout block us block us cry plead help say patrice emani 27-year-old mali say make second attempt cross libya detain western libyan city zawiya early year family pay release captain libyan ship return migrants tripoli port colonel abdelhamid adengouz say rescue drown rough condition cooperation italy migrants save death say italian ship present help us large majority migrants travel europe sea depart western libya people smuggle flourish amid lawlessness collapse economy sharp drop departures since july due arm factions prevent boat leave part coast increase activity libyan coast guard units receive train technical support italy european union human right group criticize european policy say migrants return country face widespread abuse migrants bring back libya register international agencies take overcrowd detention center offer chance return home others languish detention seek way intercept saturday west african countries include mali guinea nigeria bangladesh one male say pay 1,500 3,000 libyan dinars 176- 353 unofficial market rat make cross suffer lot kidnappings demand ransom say christopher daniel 20-year-old nigerian blindfold force give money say period spend captivity southern city sabha last year know say money waste tell parent bolster libyan coast guard intercept pack migrant boat