By James Mackenzie, Jana Choukeir and Maha El Dahan JERUSALEM/DUBAI (Reuters) -Israel's military has called up reservists in preparation for a possible resumption of fighting in Gaza if Hamas fails to meet a Saturday deadline to release more Israeli hostages and a nearly month-old ceasefire breaks down.

Families of the hostages in Gaza are struggling to maintain hope as the fragile ceasefire between Israel and Hamas seems increasingly at risk of falling apart

Famine has been mostly averted in Gaza as a surge of aid enters the territory during a fragile ceasefire, the United Nations humanitarian chief said Sunday. But he warned the threat could return quickly if the truce collapses.