NEW: UN agency heads and Israeli officials met today to discuss the humanitarian situation in Gaza amid concern of rising hunger among Palestinian civilians, I'm told by a senior Israeli official. The UN is asking for more guarantees from the Israelis about the movement of trucks inside Gaza. The Israelis say they are willing to allow these trucks to move through the Morag corridor, through Salah al-Din, through crossing 147, through gate 96 or through the Erez crossing. "We will do whatever they want," this official said. "But at the end of they day, they need to take the pallets out." Currently there are 700 trucks worth of aid sitting on the Palestinian side of the Kerem Shalom crossing, according to this official. An additional 100 trucks worth of aid is near Zikim in the north. The current plan is to allow UN aid to go directly to bakeries, central kitchen or warehouses, but the disagreements about distribution plans must first be resolved. We have reached out to UN agencies for comment. Another meeting will take place tomorrow morning to try and resolve distribution issues that would allow for more of this international aid to reach Palestinian civilians.