Human rights groups allege that Israel may have committed war crimes, while Israeli officials deny the charges, saying every effort was made to reduce civilian casualties. (Los Angeles times By Jeffrey Fleishman)
But What Happened in Gaza?
The Gaza War, codenamed Operation Cast Lead was a war between Israel and he Gaza Strip, which took place from December 2008 to January 2009.
It was also called the Gaza Massacre, Between 1,166 and 1,417 Palestinians and 13 Israelis were killed.
Also tens of thousands of Gazians were left homeless. 80 governmental buildings were destroyed.
Palestinians called the U.N. so that it punishes Israel for everything they did in Gaza, accusing them of war crimes and possibly crimes against humanity.

The United Nations reported that Israel had fired chemical agents to places with civilians, that they fired to hospitals with high artillery, didn't warn civilians, and also attacked food supplies for civilians. They also said that Israel used Palestinian civilians as human shields.It also claims that Israel used Palestinian civilians as human shields and deliberately attacked Palestinian food supplies in Gaza.
But the question is Will the U.N. punish Israel?
Well its most likely that they will, because the investigations says that they indeed commit those charges. But the decision is still not made. Israel denies all this charges and they are not willing to cooperate.
http://edition.cnn.com/2009/WORLD/meast/09/29/un.gaza.report/index.html