Captives will not be released until a ceasefire is agreed with Israel, Hamas representative Abu Hamid said, as a delegation of the group visited Moscow. Al-Qassem, the armed wing of Hamas, also posted on its Telegram account that it estimates 50 "prisoners" have been killed in Israeli bombardment. CNBC could not independently verify the figures, and the Israel Defense Forces did not immediately respond to a request for comment. The IDF has previously said that Hamas captured roughly 224 people, of which only four have been released to date. Some questions have risen over the accuracy of numbers reported by Hamas and Hamas-controlled facilities, such as the death toll supplied by the Gaza Health Ministry.

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Persons: Abu Hamid, Joe Biden Organizations: CNBC, Israel Defense Forces, IDF, Hamas, Gaza Health Ministry, U.S Locations: Gaza, Russian, Israel, Moscow