Flames and smoke billow during Israeli strikes in Gaza on October 9, 2023. (Photo: Reuters)

Moussa Abu Marzouk told Al Jazeera in a phone interview that Hamas was open to "something of that sort" and "all political dialogues" when asked whether the Islamist group is willing to discuss a possible ceasefire.

On the other hand, Hamas also threatened to execute an Israeli captive every time Israel bombs a Palestinian home without warning, as Israel called up an unprecedented 300,000 reservists and imposed a blockade on the Gaza Strip, raising fears it planned a ground assault.

The violence, which has claimed more than 1,500 lives, prompted international declarations of support for Israel after a devastating weekend attack by Hamas, and appeals for an end to the fighting and protection of civilians.

Israeli TV channels said the death toll from the Hamas attack had climbed to 900 Israelis, with at least 2,600 injured, and dozens taken captive.