>> maurice: jacqui jeras, thank you. a young american couple doing missionary work in haiti was killed in a gang ambush, according to their family. now the white house is raising the pressure for an international force to take control of security there. cbs's manuel bojorquez was on the ground in haiti at the start of this year's gang crisis, and he has the latest tonight. >> reporter: married couple 23-year-old davy and 21-year-old natalie lloyd where devoted to their mission, despite the violence plaguing haiti's capital, port-au-prince. they were working for oklahoma-based missions in haiti, a nonprofit run for more than 20 years by davy's parents, when they ran into trouble thursday. >> we never imagined what could happen happened. >> reporter: in a facebook post, the organization said the lloyds were leaving one of their churches when they were ambushed by a gang of three trucks full of guys and taken to a house where davy was "tied up and beat." a haitian employee, jude montis, came to help. but before long, anothe