Thailand’s Ministry of Foreign Affairs announced Friday that 12 of its nationals who were held hostage by Hamas in the Gaza Strip have entered Israel.

The 12 Thai hostages crossed into Egypt from Gaza via the Egyptian-controlled Rafah border crossing before being taken to Israel, according to the Thai foreign ministry.

"They are being transported to the processing point at Hatzerim Air Force Base," the ministry said in a statement. "At this time, the gender and names of these Thais are not known."

The Thai nationals will be transferred to Shamir Medical Center southeast of Tel Aviv, where they will be met by Thai embassy officials

"They are required to be under medical supervision for a period of 48 hours, without access to outsiders," the ministry said, adding that it "will do all possible to expedite their return to Thailand."

-ABC News' Will Gretsky and Morgan Winsor

The International Committee of the Red Cross confirmed Friday that its teams have begun "carrying out a multi-day operation to facilitate the release and transfer of hostages held in Gaza and of Palestinian detainees to the West Bank."

The operation, which is taking place during a four-day cease-fire between Hamas and Israel, will also "include the delivery of additional, much-needed humanitarian assistance into Gaza," according to the ICRC.

"In its role as a neutral intermediary, the ICRC over several days will transfer hostages held in Gaza to Israeli authorities and ultimately their families, and transfer Palestinian detainees to authorities in the West Bank, to be reunited with their families," the organization said in a statement. "The ICRC will also bring in additional medical supplies to be delivered to hospitals in Gaza, reinforcing the aid deliveries the ICRC has already carried out."

The ICRC urged both sides in the war to treat all hostages and detainees "with humanity" and to respect "humanitarian principles ... at all times, including during the releases and transfers."

"The parties to the conflict agreed to the details of the operation, including who would be released and when," the organization added. "The ICRC was not involved in the negotiations, and its role is to help facilitate the agreement as a neutral intermediary."

-ABC News' Will Gretsky and Morgan Winsor

The first group of Israeli hostages have been released by Hamas in the Gaza Strip and handed over to the International Committee of the Red Cross, two sources briefed on the matter told ABC News.

The sources said the Red Cross has the hostages and that the "operation" to get them home has begun.

It was expected that 13 Israeli hostages would be freed by Hamas near Gaza's border with Egypt on Friday in a prisoner exchange deal. But it was unclear exactly how many were handed over to the Red Cross.

-ABC News' Matt Gutman and Morgan Winsor

Thailand's Prime Minister Srettha Thavisin announced Friday that 12 Thai hostages have been released in the Gaza Strip near the border with Egypt and will be picked up by Thai embassy officials.

"It has been confirmed by the Security Department and the Ministry of Foreign Affairs that there are 12 Thai hostages already released. Embassy officials are on their way to pick them up in another hour. Their names and details should be known. Please stay tuned," Thavisin wrote in a post on X, the social media platform formerly known as Twitter.

Egyptian authorities confirmed earlier that 12 Thai nationals held by Hamas in Gaza would be freed at the Egyptian-controlled Rafah border crossing on Friday, in addition to 13 Israeli hostages.

There was no immediate confirmation from Israel on whether any of its nationals were released alongside the 12 Thai hostages.

-ABC News' Morgan Winsor