After announcing a ceasefire at 22:00 Saturday night, May 13, the Palestinian Islamic Jihad itself fired 35 rockets into Israel half an hour after the deadline. Israel had already accepted the truce in its five-day IDF Operation Shield and Arrow, provided it was upheld by Jihad. So the IDF responded to this first breach with a last airstrike on the terrorist group’s rocket stores
https://www.debka.com/gaza-ceasefire-faces-first-test-with-annual-jerusalem-day-flag-parade/