What we know about

ROME - The sinking of a luxury yacht on Aug. 19 off the northern coast of Sicily left seven people dead, including British tech tycoon Mike Lynch, his daughter Hannah and Morgan Stanley's Jonathan Bloomer. Here is what we know about the accident.

VIOLENT STORM The Bayesian, a British flagged 56-metre superyacht, sank in the pre-dawn dark off the port of Porticello, near Palermo, after a very severe and sudden weather event. Prosecutor Raffaele Cammarano said on Saturday the event was most likely a "downburst", a very strong downward wind that is an intense but relatively frequent event at sea, rather than a waterspout which involves rotating winds like a whirlwind or tornado. Twenty-two people were on board, and 15 survived, including nine out of 10 crew members as well as Lynch's wife, whose company owned the Bayesian.

They were found on a life raft. Six out of the 12 passengers died. Prosecutors, who have put the yacht's captain James Cutfield under investigation for manslaughter and shipwreck, said the ship would have to be pulled out of the water before the investigation could be concluded.

STERN FIRST WENT DOWN The Bayesian sent its last signal before sinking via the tracking Automatic Identification System at 0206 GMT, according to the MarineTraffic website. Chief Prosecutor Ambrogio Cartosio said a red flare alerting emergency services about the emergency was fired into the sky at 0238 GMT, more than 30 minutes after the boat had gone down. The head of Palermo's Fire B.