EXPLAINER: Are Israel, Hamas committing war crimes in Gaza?

Israel and the Hamas militant group already face allegations of possible war crimes in Gaza, a week into their fourth war

JERUSALEM -- A week into their fourth war, Israel and the Hamas militant group already face allegations of possible war crimes in Gaza. Israel says Hamas is using Palestinian civilians as human shields, while critics say Israel is using disproportionate force. Who's right? It's hard to say, especially in the fog of battle. The firing of hundreds of imprecise rockets into Israel by Hamas and other Palestinian groups is fairly clear-cut. International law prohibits targeting civilians or using indiscriminate force in civilian areas. Rockets slamming into Tel Aviv apartment blocks is a clear violation. But in Gaza, where 2 million people are packed into a narrow coastal strip, the situation is far murkier. Both sides operate in dense, urban terrain because that's pretty much all there is. Because of the tight space and intense bombardments, there are few safe places for Gazans to go. A blockade imposed by Israel and Egypt after Hamas seized power in 2007 makes it virtually impossible to leave.