Al-Rimal clinic, in the town of the same name in the Gaza Strip, was partly destroyed, while the territory's health ministry and the office of Qatar's Red Crescent were also hit, officials said.

Medical personnel at the ministry were wounded, some critically, the Hamas-run enclave's deputy health minister Yousef Abu al-Rish told reporters.

Ministry spokesman Ashraf Qidra said the Israeli strikes "threaten to undermine the efforts of the health ministry in the face of the Covid pandemic".

The raids "stopped screening tests... at the central laboratory", he added.

Before the military escalation between Hamas and Israel a week ago, authorities in Gaza tested an average of some 1,600 people per day.

The rate of positive tests was among the highest in the world, at 28 percent, and hospitals have been overwhelmed by patients.

The enclave of two million residents has so far received 122,000 vaccine doses, more than half of which have not been administered, according to the World Health Organization.

WHO says 103,000 people have tested positive for coronavirus in Gaza, of whom over 930 have died.