America's Cup organisers have announced a full probe into the capsizing of a catamaran that killed British Olympic champion Andrew Simpson, casting a pall over yachting's biggest race.
The high-speed AC72 nose-dived into the San Francisco Bay while performing a relatively common manoeuvre in normal conditions during training for the 34th America's Cup in September.
The Artemis Racing crash was the second involving the new AC72 size of sailing boat, after one involving the Oracle team in October, in which no one was injured.
The San Francisco Police Department will lead its own probe, along with coastguards, to rule out any criminal negligence or intent.
America's Cup chief executive Stephen Barclay repeatedly declined to speculate on what happened, saying America's Cup Regatta Director Iain Murray had been tasked with conducting an independent review.
Asked if AC72 boats could be barred from the race, or if the race itself could be cancelled, Barclay said nothing is off the table.