A polio vaccination campaign in north Gaza is expected to resume on Sunday, a day after the World Health Organization (WHO) said six people, including four children, were injured following a strike on the Sheikh Radwan clinic.

Axar.az reports citing foreign media.

The agency did not say who was responsible for the attack but an official from Gaza's civil defence agency told that it was carried out by an Israeli quadcopter. Israel said it is investigating but does not believe it was responsible.

Unicef, the UN's children's agency which is helping to lead the vaccination rollout, described the strike on the Sheikh Radwan clinic as "another example of the indiscriminate strikes on civilians".

The second phase of the vaccine rollout began on Saturday after being postponed in October due to intense Israeli bombardments, mass displacement and lack of access in the region.

Gaza recorded its first case of polio in 25 years in August, which left a baby boy paralysed and prompted the rollout of the programme.

The immunisations are resuming as 15 UN and humanitarian organisations have described the situation in north Gaza as "apocalyptic" nearly a month after an Israeli ground offensive began.

A humanitarian pause in the fighting has been agreed upon to allow vaccinations to restart in Gaza City, the WHO said. The campaign will run for three days.

In a post on X on Saturday, WHO chief Tedros Ghebreyesus said the centre was struck "while parents were bringing their children to the life-saving polio vaccination in an area where a humanitarian pause was agreed".