Israeli air strikes have killed at least 10 Palestinians in two separate attacks on a Gaza City police post and Nuseirat refugee camp in central Gaza.

Medical sources at al-Shifa Hospital in Gaza City said they received nine Palestinian bodies following a strike on the municipal police headquarters in the centre of the city. Another 15 people were wounded.

A correspondent reporting from Gaza City said the bombardment occurred at a busy time near a park crowded with civilians, including children.

Victims of the Gaza City strike included a newly appointed Gaza City police chief, the director of a women's police force, and several officers.

Earlier in the day, a strike on Nuseirat refugee camp killed one Palestinian, medics said, bringing Wednesday's death toll to at least 10.

The Israeli army claimed its air force struck two Hamas commanders in Nuseirat, and that it later struck a Hamas commander in the Tuffah area of Gaza City, without providing evidence of their affiliation.

Hamas, which governs the Gaza Strip, condemned what it called "a new war crime."

In a statement, Hamas rejected Israel's justification that the strike targeted "resistance leaders," calling the claim "baseless and false allegations used to justify its aggression and cover up its deliberate targeting of civilian police and unarmed civilians."

Hamas also accused the Israeli government of "deliberately undermining these efforts and dangerously pushing towards reigniting the war of extermination against our people in the Gaza Strip."

On Tuesday, Israeli strikes killed seven people, including a child, and wounded 14 others at a crowded cafe on Gaza City's harbour. The city's port has been turned into a displacement camp, according to reports. The Israeli military again claimed, without providing evidence, that it had targeted Hamas commanders in the enclave.

Wednesday's attacks came two days after US President Donald Trump's son-in-law and Middle East envoy Jared Kushner visited the region to push for a Trump-backed deal to end Israel's war on Gaza.

Kushner's meeting with Israeli Prime Minister Benjamin Netanyahu failed to break a diplomatic deadlock after Netanyahu rejected an agreement for Israel to withdraw from the Strip in exchange for Hamas disarming.

Following the meeting, Kushner reiterated "Israel's right to defend itself." He threatened that Hamas must disarm or the US would support Israel to "finish the job in the appropriate way."