First trucks carrying aid enter Gaza but besieged enclave desperately needs more

The first trucks carrying aid entered Gaza on Saturday, but international leaders have warned that much more is needed to combat the "catastrophic" humanitarian situation in the enclave that holds more than 2 million people.

The admission of trucks comes two weeks after Israel launched a complete siege of the enclave in response to deadly attacks by the militant group Hamas.

The trucks entered through the Rafah crossing, the only entry point to Gaza not controlled by Israel, as seen by CNN's team on the Palestinian side of the border. The crossing closed quickly after the 20 trucks went through.

People on the Egyptian side of the border - where aid organizations had waited for days to be given the green light - were jubilant as the crossing opened, celebrating with ululations and chants.

According to Egyptian authorities at the Rafah crossing, 13 trucks were carrying medicine and medical supplies, five were carrying food and two trucks had water.

While these supplies are desperately needed, aid workers said they are a fraction of what's required for the 2.2 million people crammed into Gaza under a blockade imposed by Israel and Egypt.

Martin Griffiths, United Nations under-secretary-general for humanitarian affairs and emergency relief coordinator, said the delivery followed "days of deep and intense negotiations," adding that the humanitarian situation in Gaza "has reached catastrophic levels."