Melt together about 3 parts potassium nitrate fertilizer (Haifa brand) and 1 part sucrose. Pour into a steel tube, which has fins welded to it. Launch from rail. This is a Gaza rocket. Range: a few miles. Warhead: a few pounds of TNT with a rifle primer as the detonator, in the nose.

Response:
http://www.latimes.com/news/nationworld/world/la-fg-gaza28-2008dec28,0,427782.story

US-built supersonic warplanes dropping hundreds of hundred pound pounds on clay structures.

Well that's proportional.

BTW, the only casualties from the rocket attacks that provoked this: a few guys who CATOd their rocket on launch.