Gaza health officials and the ambulance service say at least 25 people were killed by Israeli airstrikes and gunshots overnight as ceasefire talks appear to have stalled and Palestinians in Gaza are facing famine.

More than 1,000 Palestinians have been killed by Israeli forces since May while trying to get food in Gaza, mostly near food sites run by an American contractor, the U.N. human rights office said.

Israel denies that it is responsible for hunger in Gaza. It called the countries’ statement “disconnected from reality” and blamed Hamas for undermining aid distribution and failing to agree to a ceasefire.