Hamas rockets

"In the World War II bombings in London, the warheads were much larger than those used by Hamas, carrying about 2,000 pounds of explosives; in the Gulf War of 1991, SCUD warheads were also much larger, about 500 pounds each. In the case of the recent artillery rocket attacks against Israel, the overwhelming number of artillery rocket warheads are in the 10- to 20-pound range. These small warhead sizes make early warning and protective sheltering even more effective, because the smaller warheads are very unlikely to penetrate or destroy a shelter."