Earlier in the day, Hamas handed over three Israeli captives to the Red Cross in the Gaza Strip -- Or Levy, Ohad Ben Ami, and Eli Sharabi.
Hamas accused Israel of adopting a policy it described as the "slow killing" of Palestinian prisoners held in Israeli jails after seven inmates freed on Saturday were admitted to hospital.
"The fact that seven prisoners were transferred to hospitals immediately after their release... reflects the systematic assaults and mistreatment of our prisoners by the Israeli prison authorities," Hamas said in a statement, adding that it was "part of the policy of the extremist Israeli government, which pursues the slow killing of prisoners inside the prisons".
Israel is releasing 183 prisoners in the fifth swap of captives for prisoners since the ceasefire in the Israeli war on Gaza came into effect on 19 January.
Eighteen captives and more than 550 Palestinian prisoners have already been freed in that time.
The first phase of the ceasefire calls for the release of 33 captives and nearly 2,000 prisoners, the return of Palestinians to northern Gaza, and an increase in humanitarian aid to the devastated territory. Last week, wounded Palestinians were allowed to leave Gaza for Egypt for the first time since May.
It is not clear whether Israel and Hamas have begun negotiating a second phase of the ceasefire, which calls for releasing the remaining captives and extending the truce indefinitely. The war could resume in early March if an agreement is not reached.
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