By Ali Sawafta GAZA (Reuters) -Doctors at Gaza's largest hospital say crippling fuel shortages have led them to put several premature babies in single incubators as they struggle to keep the newborns alive while Israel presses on with its military campaign.

GAZA (Reuters) -Overwhelmed doctors and patients at Gaza's largest medical centre could soon be plunged into darkness because of dwindling fuel supplies, which doctors say threaten to paralyze Al Shifa hospital as Israel presses on with its military campaign.

CNN’s Paula Hancocks reports on the situation in Gaza as doctors try to keep preterm babies alive in a warzone where formula, medicine and fuel are in short supply.

An Israeli strike killed 15 people, including women and children, gathered outside a health center in the central Gazan city of Deir Al Balah on Thursday, according to medical staff and officials in the enclave.

At least 15 people, including six children, were killed in an Israeli strike in the Gaza city of Deir al-Balah on Thursday. Hamas has labelled the incident an "atrocious crime" while the Israeli Defense Forces says it was targeting a Hamas fighter. It is the latest deadly incident involving aid sites in Gaza.

One by one, displaced Gazans would pass through security checkpoints where they would be searched for weapons or signs of links to Hamas before being allowed into a new “humanitarian city” built on ruins.

Israel’s defense minister said he told the military to advance plans for what he called a “humanitarian city” built on the ruins of Rafah in southern Gaza, according to reports in Israeli media.