The United States military used its GBU-43/B Massive Ordnance Air Blast Bomb (MOAB), nicknamed “the mother of all bombs,” for the first time in combat. The US Air Force used it in Afghanistan to target Islamic State tunnels and personnel. The 21,000-pound (9,525 kg) bomb was dropped in the Achin district of the Nangarhar province in eastern Afghanistan. Newsclick spoke to Prabir Purkayastha, to know more about MOAB. He explains that MOAB is nothing but larger form of barrel bomb. They are not hi-tech and can be constructed by anyone. A barrel bomb is an improvised unguided bomb, sometimes described as a flying IED (improvised explosive device). They are typically made from a large barrel-shaped metal container just like MOAB that has been filled with high explosives, possibly oil or chemicals as well, and then dropped from a helicopter or airplane.