Two Italian knowledge specialists and a resigned Israeli security forces member were among four victims of Sunday's boating disaster on Lake Maggiore in northern Italy, local officials say.

They named the Italians Claudio Alonzi, 62, and Tiziana Barnobi, 53. The Israeli was distinguished as Shimoni Erez, 50.

Anya Bozhkova, the 50-year-old Russian spouse of the boat's captain, also died.

The vessel with in excess of 20 tourists and a team sank in strong winds.

As indicated by Italian media sources, the boat had been conveying around 25 individuals who were celebrating a birthday when a storm developed over the lake, later turning into a "small hurricane".

The 16m (52ft) long boat capsized and sank on Sunday evening between the towns of Sesto Calende and Arona.

Everyone onboard went into the water, but many of the passengers swam ashore or were rescued by other boats.

Rescue divers and a helicopter scrambled to help with the search at the lake's southern end, and several ambulances and an air ambulance attended the scene.

A video shared by firefighters showed chairs and other debris floating in choppy waters.

Five people were taken to hospital.

Lake Maggiore - on the south side of the Alps - is shared by Italy and Switzerland and is a popular destination for tourists.

The area has recently seen poor weather, with Italy's meteorological service issuing thunderstorm warnings.