Three more Israeli hostages were freed on Saturday in the fifth round of exchanges between Israel and Hamas, as uncertainty looms over the next stage of the Gaza ceasefire agreement as well as the enclave’s long-term future.

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.