Palestinian health officials and the local ambulance service say Israeli airstrikes and gunfire have killed at least 25 people in the Gaza Strip.

"The humanitarian catastrophe that we are witnessing in Gaza must end now," a joint statement from the three countries reads.

The United Nations and experts say that Palestinians in Gaza are at risk of famine, with reports of increasing numbers of people dying from causes related to malnutrition. Yet Israel says hundreds of truckloads of aid are waiting at the border for the U.