Hizbullah rockets cannot be fired from buildings (ie the one bombed in Qana)

(...) The type of missiles being fired by Hizbullah at Israeli cities cannot be fired from within houses, mosques, hospitals or even UN facilities as has been suggested by the IDF. Due to the massive "back-blast" caused by the rocket launchers of these missiles, they can only be fired from open ground. To fire them from within a building would result in the instant death of the missile crew and probable destruction of the missile before launch. Most of the missiles are truck-mounted and are fired - on open ground - from the backs of flat-bedded trucks or larger four-wheel-drive vehicles.

When fired, these missiles generate an enormous flare of light, heat and sound energy - a heat and light signature which is readily detected by IDF target-acquisition systems. Accurate retaliatory fire can be directed at Hizbullah launch sites by IDF aircraft and ground artillery in seconds. Such a reaction would be considered by international military norms to be proportionate and within the general "rules of engagement". (...) Read more here.

Author Tom Clonan is The Irish Times security analyst. (h/t whatreallyhappened.com)