Israel-Gaza live updates: Hamas publishes names of 20 living Israeli hostages to be released

International Committee of the Red Cross teams in Israel, Gaza and the West Bank "will support," the implementation of the ceasefire agreement "by helping to return hostages and detainees to their families," ICRC President Mirjana Spoljaric said in a statement on Friday.

The ICRC teams are also "prepared to bring more lifesaving aid into the Gaza Strip," Spoljaric said.

"The coming days are critical. I urge the parties to hold to their commitments. Release operations must be carried out safely and with dignity. Humanitarian assistance must resume urgently at full capacity and be delivered to people safely wherever they are. The ceasefire must hold. Lives depend on it," Spoljaric added.

The Israel Defense Forces warned residents in Gaza not to approach IDF troops "until further notice," IDF Arab media spokesperson Avichay Adraee said in a Friday X post.

"Approaching the forces puts you at risk," Adraee said in the post.

"These are moments of heightened alert," IDF spokesperson Effie Defrin said during a briefing with reporters Friday, warning "IDF soldiers will act to remove any threat to their security," inside of Gaza along the redeployment lines where they are now positioned.

"At this time our troops under Southern Command have deployed to the agreed readiness lines, in accordance with this 'yellow line,' these readiness lines provide forward operational defense and control along the Gaza Strip," Defrin said.

-ABC News' Jordana Miller

The Israeli Defense Forces released videos showing forces redeploying inside of Gaza.

The IDF said they completed redeployment along the agreed-upon lines in the first phase of the ceasefire deal at 5 a.m. eastern time on Friday, less than 12 hours after the Israeli government approved the first phase of the deal.

Along these lines, the IDF controls more than 50% of the Gaza Strip.

-ABC News' Jordana Miller

A ceasefire is now in effect as of 12 p.m. local time on Friday in Gaza, according to the IDF.

"Since 12:00, IDF troops began positioning themselves along the updated deployment lines in preparation for the ceasefire agreement and the return of hostages," the IDF said in their statement. "IDF troops in the Southern Command are deployed in the area and will continue to remove any immediate threat."