Hayya says its former leader died in combat, after US president Joe Biden says his death is a "moment of justice".

Speculation grows on Hamas' next leader after Sinwar's killing with several contenders likely being considered by the militant group.

The Palestinian militant group Hamas will likely replace Yahya Sinwar with a new political leader based outside Gaza while his brother - Mohammad Sinwar - is expected to assume a bigger role directing the war against Israel in the territory,