President Donald Trump on Thursday warned that if Hamas keeps killing people in Gaza, “we will have no choice but to go in and kill them,” marking a sharp escalation of his rhetoric against the group as he tries to maintain a ceasefire in its conflict with Israel.

The threat – just three days after the deal was signed in the Middle East – came amid reports that Hamas fighters have used the truce to quickly and violently reassert control over the Gaza Strip, targeting Palestinians who they deemed to have collaborated with Israeli forces during the war.

“If Hamas continues to kill people in Gaza, which was not the Deal, we will have no choice but to go in and kill them,” Trump wrote in a post on Truth Social. “Thank you for your attention to this matter.