A visitor near a steaming fumarola at the Solfatara crater bed earlier this year.Credit:AP
The victims were a 45-year-old man,a 42-year-old woman and their son. Another seven-year-old son did not fall into the hole and was unharmed,national fire brigade spokesman Luca Cari said.
"Either there was a small explosion,or the ground simply gave way from their weight,and they fell into this hole,"Mr Cari said."It was inside a fenced-off area."
The sprawling constellation of ancient volcanic centres are a tourist attraction.Credit:AP
Firemen on the scene said the three victims,who were on holiday from northern Italy,appeared to have died from asphyxia,possibly because of hot gases emanating from the ground. The official cause of death will be determined by an autopsy.
The Solfatara volcano is one of many volcanic craters in the Campi Flegrei area,20 kilometres west of Naples,which first opened up to tourists in 1900,according to its website. The accident happened at the Bocca Grande (Big Mouth),the largest of the fumaroles in the area,which the ancient Romans called the home of the God of fire.
The ground at the site emits water vapours of 160 degrees Celsius and gases including poisonous hydrogen sulphide,the website said.
Reuters