Four people died late on Sunday after a tourist boat capsized on Lake Maggiore in northern Italy due to a sudden whirlwind, the fire brigade and media reported.

People were celebrating a birthday on the 16-metre-long boat when it capsized and sank in a violent storm.

Nineteen survivors swam to shore without serious injury, fire brigade said on Twitter, adding the wreck was found by its divers at a depth of 16 metres. (Reporting by Cristina Carlevaro; Editing by Toby Chopra)