Israel and Poland are locked in an escalating diplomatic spat over a Polish bill that critics say will make it harder for Jews to recover property they allegedly lost in World War II.

A 45.5-metre deep diving pool with artificial underwater caves and Mayan ruins opened near Warsaw this weekend.

The Polish police have arrested more than 300 people in capital Warsaw after clashes with far-right supporters.

Hundreds of small business owners held a horn-honking car protest in Warsaw's downtown to call for government support amid restrictions on business brought about by the country's COVID-19 protection measures.

The Palestinian resistance group decried Israel's participation in the forthcoming US-sponsored meeting.

Media reports say Israel will send a delegation to an upcoming anti-Iran conference in Manama co-hosted by Bahrain, the US and Poland.

A top Hamas official says any attempt aimed at the liquidation of the Palestinian cause is doomed to failure.