Palestinian health workers say an Israeli strike on a built-up refugee camp in the occupied West Bank has killed two people as a ceasefire in the Gaza Strip entered a third day.

Under the terms of the fragile Israel-Hamas ceasefire deal , fighting will be halted in Gaza for at least six weeks. Dozens of Israeli hostages and hundreds of Palestinian prisoners will be freed, while more aid flows in .

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.

Israel allowed displaced Gazans to begin crossing a military zone that bisects the enclave after a deadlock over hostage releases was broken.

The release of four female Israeli soldiers from Hamas captivity on Saturday came at a heavy cost for Israel. Israel released 200 Palestinian prisoners, 120 of them serving life sentences, from its jails as part of a ceasefire deal.