The fragile ceasefire between Israel and Hamas was at risk of faltering Tuesday after President Donald Trump warned "all hell is going to break out" if the Palestinian militant group does not release "all" remaining hostages this week. The war in Gaza is on pause following a complex agreement in which remaining hostages held by Hamas in Gaza are incrementally exchanged for Palestinian prisoners and detainees in Israel. But Hamas said late Monday that it was indefinitely postponing the next hostage-prisoner swap Saturday.