Pope Francis has stepped up his recent criticism of Israel’s military campaign in Gaza, calling the humanitarian situation in the Palestinian enclave “very serious and shameful”, Reuters reports.

In a yearly address to diplomats delivered on his behalf by an aide, Francis appeared to reference deaths caused by winter cold in Gaza, where there is almost no electricity.

“We cannot in any way accept the bombing of civilians,” the text said.

“We cannot accept that children are freezing to death because hospitals have been destroyed or a country’s energy network has been hit.”