Hamas accused Israel on Friday of breaching their ceasefire accord and it delayed announcing the names of three more Israeli hostages due to be exchanged for Palestinian prisoners in the latest stage in a fragile deal aimed at ending the war in Gaza.

Hamas has named the next three Israeli hostages it plans to release as part of the ceasefire deal, showing the agreement is moving forward even as the US and Israel discuss plans to relocate all of Gaza’s population.

It is believed that at least two of the six American hostages still held in Gaza are alive — Sagui Dekel-Chen, 35, who grew up in Bloomfield, Connecticut, and Edan Alexander, 19, from Tenafly, New Jersey. Four other Americans are believed to have been killed in captivity.

Latest news and live updates on the Gaza ceasefire deal as four female hostages are set to be released. The hostages are all Israeli soldiers.

The fragility of the truce between Israel and Hamas was laid bare on Saturday, after Israel accused Hamas of withholding a hostage, prompting a halt in the movement of Gazan civilians back to their homes in the north.

Hamas have so far freed 18 hostages in exchange for around 600 Palestinian prisoners released from Israeli jails

The cease-fire has held despite a dispute earlier this week over the sequence in which the hostages were released.

Hamas militants freed three male hostages held for more than a year in the Gaza Strip on Saturday and Israel released 183 Palestinian prisoners from Israeli jails in the fourth such exchange of a ceasefire deal that has halted 15 months of intense fighting.

The three civilians will be exchanged for more Palestinian prisoners in the latest swap on Saturday.