GAZA: Israel has killed at least 23 Palestinians in attacks across the Gaza Strip in one of the deadliest days since an October “ceasefire” began, according to medical sources.

The sources told Al Jazeera several children were among the casualties on Wednesday, including an 11-year-old girl.

At least 14 people were killed in Israeli shelling on the Tuffah and Zeitoun neighbourhoods of Gaza City. Another four were reported dead in an attack on tents sheltering displaced people in the Qizan Abu Rashwan area, south of Khan Younis, in southern Gaza.

An additional two people were killed by Israeli air attacks on the al-Mawasi coastal tent camp. The Palestine Red Crescent Society said one of the victims was first responder Hussein Hasan Hussein al-Sumairy.

Israel’s military said its armoured units and aircraft conducted attacks in northern Gaza after a reserve officer came under fire and was severely injured.

It said the officer was evacuated to hospital after the incident, which took place “during routine operational activity” near the “yellow line” that demarcates areas under Israeli military control.

Israel has killed more than 520 Palestinians since the “ceasefire” went into effect nearly four months ago.