The office of Israeli Prime Minister Benjamin Netanyahu said on Saturday that the images of three freed captives in Gaza were "shocking".
"The shocking images that we have seen today will not go unaddressed," the office said in a statement after Hamas militants brought the three pale-looking hostages onto a stage before handing them over to the Red Cross.
The Israeli military said that the three captives freed by Hamas on Saturday were now in the custody of its troops in Gaza.
"Three returning hostages have just been transferred to IDF (military) and ISA (domestic security agency) forces in the Gaza Strip," the military said in a statement.
The three captives were identified as Eli Sharabi, Or Levy and Ohad Ben Ami.
Dozens of armed Hamas fighters formed a cordon around an open area in the city of Deir el-Balah early Saturday, apparently to control crowds eager to watch the captives' release.
As with past exchanges, a stage was erected for the occasion, festooned with a banner bearing images of destroyed Israeli armoured vehicles and a dejected-looking Benjamin Netanyahu, Israel's prime minister.
Former captive Yarden Bibas, who was freed last week by Hamas militants in Gaza, on Friday urged Netanyahu to help bring back his wife and two children from the Palestinian territory.
"Prime Minister Netanyahu, I'm now addressing you with my own words... bring my family back, bring my friends back, bring everyone home," Bibas said in his first public message following his release.
Hamas previously said his wife Shiri and his two sons Ariel and Kfir -- the youngest captive -- were dead, but Israel has not confirmed their deaths.
The exchange comes despite uproar in the region over a proposal by US President Donald Trump to clear out the Gaza Strip of its inhabitants and for the United States to take over the Palestinian territory.
Netanyahu, who is in Washington, will "monitor this phase of the captives' release from the control centre of the delegation in the US", the premier's office said in a separate statement.
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