They keep coming. Shipwrecks between Libya and Italy since Wednesday have killed as many as 700 migrants, the U.N. refugee agency reported. It started with an overloaded boat that began rocking as passengers moved to one side after seeing a rescue vessel, then capsized, leaving 100 missing. On Thursday, an estimated 550 disappeared after their boat flipped, and an unknown number are reportedly missing from a Friday sinking. Save the Children says some 13,000 attempted the crossing last week, and Italy is struggling to accommodate those who survive.