Thirteen Israeli hostages have been transferred to Egyptians, according to local media, as part of a truce deal with Hamas.
Twelve Thai nationals have also been freed by the militant group, its Prime Minister Srettha Thavisin has said.
Sky News understands no British nationals held hostage are set to be released today.
Israel-Gaza latest – follow live
Under the temporary truce period, which will see fighting paused for four days in Gaza, Palestinian prisoners will also be freed in exchange.
Some 50 women and children being held by Hamas are due to be freed over the period.
Israel said it would stop its offensive on the Gaza Strip for an extra day for every 10 additional hostages released.
It is expected to free a total of 150 Palestinian prisoners from Israeli jails during the temporary ceasefire in exchange for the hostages, though officials have published a list of 300 in case the deal is extended.
As part of the agreement, humanitarian relief, medical and fuel aid are to be allowed into the entirety of the besieged enclave, which has been gripped by a humanitarian crisis following weeks of Israeli bombardment, with fuel and medical supplies cut off.
Israel will also halt surveillance in southern Gaza and curtail it to six hours a day in the north.
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