A bomb that uses a fuel-air explosive.
A bomb that generally detonate in two stages: a small blast creates a cloud of explosive material, which is then ignited with devastating effect.
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At least 70 people died in what activists said where four vacuum bombs dropped by the Russian air force in the town of Maaret al-Numan.
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At least 70 people died in what activists said where four vacuum bombs dropped by the Russian air force, January 2016.