Mediator Qatar announced early Monday that an agreement has been reached to release an Israeli civilian hostage and allow Palestinians to return to northern Gaza, easing the first major crisis of the fragile ceasefire between Israel and Hamas.

There is currently no indication of the presence of the hostages. Hamas is expected to release Karina Ariev, 20; Daniella Gilboa, 20; Naama Levy, 20; and Liri Albag, 19. In exchange, Israel will release 200 Palestinians being held in prisons.

Israel accused Hamas of violating a fragile ceasefire by changing the order of hostages it has released, stopping thousands of Palestinians from returning to their homes in the northern Gaza Strip on Sunday.