Hamas tightened its grip on Gaza's ruined cities Tuesday, launching a crackdown and executing alleged collaborators, even as US President Donald Trump vowed to disarm the group.The Israeli military said the remains of four more hostages held in Gaza had been brought into Israel, a day after Hamas handed over the bodies of four other captives and released the last 20 surviving hostages. Hamas published a video on its official channel showing the street execution of eight blindfolded and kneeling suspects, branding them "collaborators and outlaws".The footage, apparently from Monday evening, emerged as armed clashes were underway between Hamas's various security units and armed Palestinian clans in parts of the territory, on the fifth day of a US-brokered truce between Hamas and.