UN agencies have said the two main crossings into the southern Gaza Strip remain shut, virtually cutting off the Palestinian enclave from outside aid with few stocks positioned inside, Reuters reports.

The global agency’s humanitarian office spokesperson Jens Laerke told journalists Israel had shut both the Rafah and Kerem Shalom crossings for aid and people as part of its military operation in Rafah, where around one million uprooted people are sheltering.

“The two main arteries for getting aid into Gaza are currently choked off,” Laerke said, adding UN agencies had very low stocks inside the Gaza Strip since humanitarian supplies were consumed immediately. The enclave has just a one-day buffer of fuel stocks, he said.

“If no fuel comes in for a prolonged period of time it would be a very effective way of putting the humanitarian operation in its grave,” he said.

A World Health Organisation spokesperson said in response to a journalist’s question that no exceptions were being made for sick and injured patients.

While some non-fuel supplies have entered Gaza via the northern Erez crossing in recent days, the UN agencies said this was insufficient and difficult to deliver to Rafah since it meant crossing active combat zones.

“Erez will simply not be enough,” said James Elder, a spokesperson for the United Nations children’s agency. “If Rafah gate closes for an extended period, it’s hard to see how famine in Gaza can be averted,” he said.