Here's a typical statement from Multi-National Forces Iraq (i.e. the US military) --
BAGHDAD — Insurgents launched nine indirect fire attacks into neighborhoods in the Iraqi capital 12-13 July as Iraqi and Coalition Forces continue to seek out and destroy these cells ... "Whether they are aiming at Iraqi and Coalition Forces or at civilians, these sorts of attacks endanger all Iraqis," said Lt. Col. Scott Bleichwehl, official spokesman for the Multi-National Division - Baghdad and the 1st Cavalry Division.
"Indirect fire attacks pose a significant threat to all citizens," Bleichwehl said. "Identifying and destroying the insurgents who use such tactics is the focus of many of our operations."
Interesting fact #1: "Indirect fire" is the military term for mortars. It gets across that it's not a particularly accurate weapon since it's not "directly", if you will, aimed at anything.
Interesting fact #2: The Israeli attack on the UN school in Gaza (Jebaliya) used mortars.
UPDATE: If Israel can so quickly name the Hamas fighters it was targeting in the school, why could it not use more selective weapons than artillery shells against them?