The people in the bomb shelter were casualties of war a war that was legal as legal it can be. The Gulf War of 1991 was launched as result of Iraq ignoring the UN Security Council Resolution to withdraw from occupied Kuwait.
But then again if the war is not legal .....
What is legal in the US might be illegal in Belgium.
As a matter of fact, Belgium keeps changing its own laws in order to accommodate this political theater.
Israel's Sharon was indicted for something that his allies did.
He has been accused of mass murder and indicted because his soldiers did not prevent a militi group from attacking a palestine camp in Lebanon. The Belgium expected the average Israeli soldier on a check point to have read the minds of the militi members as they passed by, and stopped them.
Bush could be indicted for something a free Iraqi allie does, or some war crime done by an enemy soldier if we could have read their minds too.