What is the purpose of Israel’s repeated attacks on UNRWA?

An Israeli air strike on a school in Gaza kills six people working for the UN agency for Palestinian refugees.
That is the most the organisation has lost in a single incident in the war.
Attacking schools and places of shelter is a war crime. But UNRWA has been repeatedly attacked by Israel during its war.
Why is the agency so important to Palestinians – and why does Israel want to destroy it?
 
Presenter:
James Bays
Guests:
Riham Jafari – communication and advocacy coordinator at ActionAid Palestine
Chris Gunness – former UNRWA spokesman
Tamara Alrifai – UNRWA spokesperson