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.
1At 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.
2At least 70 people died in what activists said where four vacuum bombs dropped by the Russian air force, January 2016.