The Dominican Republic authorities launched a series of measures Thursday to stop the flow of undocumented Haitian immigrants into its capital.The military and the migration authorities inspected public and private transportation vehicles in four major highways leading to Santo Domingo.The authorities said they had arrested many undocumented immigrants, but did not release specific numbers."The goal of the mission is to impede the mobility of undocumented immigrants into the capital, mainly those coming from the border," the army's intelligence service said in a statement."It is not a new measure, but part of continued coordinated work by our institutions ... to stop the entrance of undocumented people from the Dominican-Haitian border," it said.Authorities estimate nearly 800,000 Haitians...