Rome (CNN) An 11-year-old boy died after he fell into a volcanic crater in Italy and his parents also died when they tried to help him, police said.

The incident happened Tuesday at the Solfatara Crater in Pozzuoli, a popular tourist attraction near Naples.

Naples police told CNN the family of four was visiting from Turin, and the 11-year-old boy wandered into an area that is off-limits to visitors.

A view of Solfatara crater near Naples on September 12.

The Solfatara, a dormant volcano, emits sulfurous fumes. The area around it is known for a type of quicksand, which makes the ground unstable.

It's not known if the boy lost consciousness because of the fumes or if the quicksand pulled him in. But when his parents tried to rush to his rescue, they too were were sucked in, police said.

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