By Emma Farge

GENEVA (Reuters) -Mothers of Israeli hostages held in Gaza, including one who appeared emaciated in a recent Hamas video, voiced fears on Tuesday that a planned Israeli offensive could further endanger their sons' lives due to the risk of reprisals.

Israel plans a much-criticised new Gaza offensive to take control of Gaza City in the almost two-year-old war against Palestinian militant group Hamas. Bombardment of the city is underway but the timing of the full offensive is uncertain and efforts to salvage a ceasefire continue.

"When I heard that our........

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