An 11-year-old boy had wandered into a prohibited area and fell into a crater at Solfatara di Pozzuoli, one of 40 volcanoes in the Campi Flegrei area west of Naples, The Guardian reported, citing Italian press reports.
Another of the couple's sons, a seven-year-old, survived amid reports he was able to scramble to safety.
It's not known if the boy lost consciousness because of the fumes or if the quicksand pulled him in.
The boy slipped after breaching a fence surrounding the Solfatara Crater in Pozzuoli and his parents followed in an attempt to rescue their son, police said.
"I saw a child run crying, I did not think I was facing the worst tragedy of my life", said eye witness Diego Vitagliano.
Parents and boy (11) die in Italian volcano crater
The family, from Turin in northern Italy, are understood to have fallen 5ft.
Their seven year old son was also with them but stayed behind the barrier while his parents rushed to help his brother. A tragedy, they pulled out two bodies, then pulled us away.
Tourists are allowed to walk around the ground level Solfatara crater, which is dotted with trees, while admiring fenced off bubbling mud pools and fumeroles that spurt steam and sulphurous gases.
The Campi Flegrei is an area with more than 30 volcanic craters, whose possible eruptions worry scientists.
The Independent reported that the volcanic crater is in the Phlegraen Fields and that the fields are scorching hot only a few inches below the surface.
Air Berlin cancels dozens of flights The airline has been struggling for some time and over the past two years has announced losses amounting to 1.2bn euros (£1.1bn). Air Berlin continues to operate due to a 150 million euro ($180 milliom) credit loan from the German government.
Volkswagen has revealed the next stage of its electric vehicle plans with the unveiling of an updated version of the I.D. An 80% charge is reportedly possible using a 150 kW charger - of which precious few exist at the moment.
Rohingya refugees walk through a paddy field after crossing the Bangladesh-Myanmar border in Cox's Bazar, Bangladesh. Myanmar leader Aung San Suu Kyi has come under global pressure to halt the violence.
Lady Gaga has revealed that she will "take a rest" and "slow down for a moment for some healing" after the Joanne World Tour. For young women and girls, I think (it's) a story of what it means to be both powerful and vulnerable, and be generous".
The A-lister Angelina Jolie arrived Toronto International Film festival with all her kids who are supporting their mother always. After Jolie's remarkable achievement in the world of acting, her ingress into the world of filmmaking already looks promising.
But for Tesla , managing variations using software makes sense, given that the company sells only three vehicles now . Otherwise, the other Superchargers are reportedly online and accessible on the way north.
Equifax has developed a comprehensive portfolio of services to support consumers determine if their data has been affected. Equifax's ham-handed response is reviving calls to weed out mandatory arbitration from the finance industry.
The evidence on how much, if any, is safe to drink, or at what stages of pregnancy, is notable by its absence, they add. But the evidence on how much, if any, is safe to drink, or at what stages of pregnancy, is notable by its absence.
Egypt accuses Hasm of being a militant wing of the Muslim Brotherhood, an Islamist group it outlawed in 2013. The officials spoke on condition of anonymity because they were not authorised to brief media.
Moreover, movie buffs will be happy to find out that major Hollywood studios will be bringing their 4K movies to the iTunes Store. Having these same movies on iTunes and loading them onto your Apple TV suddenly makes more sense, depending on the movie.
Espanyol almost pulled a goal back just before the break when Pablo Piatti rattled the upright from the edge of the box. A frantic finish saw Bale head inches wide from Isco's cross at the back post four minutes from time.
Florida Governor Rick Scott updates Irma recovery
There are widespread water and power outages, and the Florida Keys Aqueduct Authorities issued a precautionary boil water notice. FEMA officials estimated that 25 percent of homes were completely destroyed , while another 65 percent suffered serious damage.
Final Teaser of the Mercedes-AMG Project One Hypercar
It's also said that it can dash from 0 to 124 miles per hour in under 6 seconds, which is less than most cars can get to 60. While AMG is celebrating its 50 anniversary this year, the Project One will surely be a great auto to do it with.
Manatees left high and dry by Irma rescued
The Facebook post has been liked more than 63,000 times and has more than 49,000 shares on the social media site. But once the eye passes and the wind reverses, the water will rush back in.