An Italian prosecutor on Saturday opened a manslaughter investigation into the deaths of British tech magnate Mike Lynch and six other people who were killed when a luxury yacht sank off Sicily this week. The head of the public prosecutor’s office of Termini Imerese, Ambrogio Cartosio, announced the investigation at a press conference, saying the probe was so far not aimed at any individual person. He added there was no legal obligation for the captain, crew and passengers to remain in Italy but authorities expected them to cooperate with the probe.