Two people have died after a speedboat crashed off the north Cornish coast.
Four others were seriously injured when they were thrown from the boat off Padstow harbour. They have been airlifted to hospital.
Children and adults suffered leg injuries of varying degrees of severity, John Oliver from South Western Ambulance Service said.
Police are looking into reports that the boat may have struck kayakers in the water when it lost control.
The sunny bank holiday weather had drawn a lot of visitors to the harbourside, and the surrounding waters of the Camel Estuary were said to have been calm on Sunday afternoon when the accident happened.
'Badly shaken up'
At about 15:50 BST, Falmouth coastguard received a number of reports from members of public that six people had been thrown from a speedboat.
They reported seeing the boat "out of control for a short time" and striking some other boats, Jo Rawlings, from the Maritime and Coastguard Agency, told the BBC.
The injured were being treated at Derriford Hospital in Plymouth, the Maritime and Coastguard Agency said.
Matt Pavitt, the Coastguard sector manager for North Cornwall, said the injured four were "badly shaken up".
Lifeboats from Rock and Padstow, coastguard rescue teams, and search and rescue helicopters were all called to help the group.
Police are also at the harbour, an area of which has been cordoned off.
It is not yet known whether the vessel was commercially or privately owned.
Reproduced under licence from BBC News © 2013 BBC