Research says pyroclastic flow, cloud of gases, ash and other particles, engulfed city for short period of time
A giant cloud of ash and gases released by Vesuvius in 79 AD took about 15 mins to kill the inhabitants of Pompeii, research suggests.
Numerous studies have confirmed that the estimated 2,000 people who died in the Roman city were asphyxiated rather than killed by the lava.
