Ashraf al-Qidra said warplanes targeted a group of people in Deir al-Balah, killing 37-year-old Mahmoud Muhammad al-Jourani late Saturday.
Earlier, an airstrike hit a civilian car in the al-Barazil neighborhood in eastern Rafah, killing Said Atif Tamraz, 26, and Muhammad Adil al-Ayidi, 28.
Eight Palestinians have been killed by Israeli attacks on Saturday, as warplanes continue to target various sites across Gaza.
The latest deaths bring the number of Palestinians killed in Israel's 33-day offensive on Gaza to 1,914. Some 9,861 Palestinians have been injured throughout the assault, according to the Ministry of Health.
The United Nations says at least 1,354 of the dead were civilians, including 447 children.
Earlier Saturday, Israeli shelling injured five Palestinians in northern Gaza City, a Ma'an reporter said.
Before that, medics recovered the body of a Palestinian child in the Shujaiyya neighborhood of Gaza City.
An army statement said warplanes had carried out more than 100 strikes in Gaza since Friday morning, 49 of them on Saturday, targeting “those responsible for the rocket fire”.
NTJ/HH