As the Gaza ceasefire takes hold, aid workers caution that the toughest challenges are yet to come, describing the truce as only the first step on a long road to recovery.

The ceasefire came into effect Sunday after an initial three-hour delay, during which almost 20 more Palestinians were killed, according to medics in the decimated Palestinian territory. Under the terms of the deal,

Once the guns fell silent, Palestinians celebrated in the streets of Gaza while Israelis streamed into Tel Aviv’s “Hostages Square” to await their return.