There are concerns Russia's using thermobaric weapons - some of the most brutal weapons in existence - during its invasion of Ukraine.
Also known as vacuum bombs, the explosives come in various sizes, and can be fired from hand-help launchers or rocket launchers.
A typical bomb has two separate explosive charges.
Before hitting the ground, the first charge scatters the bomb's explosive material in a cloud of extremely flammable fine particulates.
The easily dispersed aerosol flows around objects and into structures like tunnels and bunkers.
Then, a second charge detonates the cloud, creating a massive fireball and supersonic shockwave.
Air is sucked into the explosion, creating a vacuum, generating a much more devastating and longer lasting blast than conventional explosives.
It can obliterate everything it its path, and vaporise human bodies.
Only nuclear bombs are considered worse.
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Russia used thermobaric weapons in the Chechnya conflict, while the US used them in the hunt for Osama bin Laden and in Vietnam.
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