The Israeli military said that aid organisations completed a second polio vaccination round for children in Gaza, administering more than 1.1 million vaccinations in different areas of the enclave, achieving 90 per cent coverage, Reuters reports.

Limits on the area covered by a humanitarian pause in the fighting to conduct the campaign meant the campaign in northern Gaza was largely restricted to the area around Gaza City, the WHO said.

Out of a total of 1,107,541 vaccinations for children across Gaza, there were 211,170 vaccinations in northern Gaza, 379,361 vaccinations in central Gaza and 517,070 vaccinations in southern Gaza, the military said in a statement.

Cogat, the military agency that deals with Palestinian civilian affairs, has been working with international agencies to coordinate the campaign, which requires two vaccine doses per child.

On Tuesday, Rik Peeperkorn, the WHO representative in the Palestinian Territories, said the mass evacuations from areas in northern Gaza where the Israeli military has been operating for more than a month, had made it difficult to estimate the number of children who might be missed in the north.