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President Donald Trump pressed Hamas to return the bodies of all deceased hostages or face "action" from nations involved in the Gaza ceasefire plan. "We have a very strong PEACE in the Middle East, and I believe it has a good chance of being EVERLASTING," Trump wrote in a Saturday social media post. "Hamas is going to have to start returning the bodies of the deceased hostages, including two Americans, quickly, or the other Countries involved in this GREAT PEACE will take action," Trump added. The bodies of 13 hostages are still believed to be in Gaza. Hamas committed to returning all living and deceased captives being held in the strip as part of the ceasefire deal reached earlier this month. All 20 living hostages and the bodies of 15 deceased captives have so far been released. Hamas officials have said the group is continuing to search for the remaining hostage bodies, saying the devastation caused by Israel's attacks on Gaza has complicated recovery efforts. -ABC News' Hannah Demissie