Hamas's armed wing claims it lost only 48 fighters in the 22-day war with Israel, as the fragile ceasefire held for a second night.
The militant group's armed wing also vowed to fight on unless Israel withdraws its troops from the Palestinian territory.
"We announce to our people the martyrdom of 48 Qassam fighters," Abu Obeida, spokesman for the Ezzedine Al-Qassam Brigades, said in a televised press conference.
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He also said Hamas inflicted heavy losses on Israeli forces and killed 80 soldiers, but offered no evidence to support the claim.
Israel has claimed it killed more than 500 Hamas members during Operation Cast Lead which it launched on Gaza on December 27.
The Jewish state says it wants its soldiers to withdraw from Gaza as quickly as possible after claiming it had met its objectives in the three-week war.
