Hamas released three Israeli civilian men it held hostage in Gaza for the past 16 months, and Israel freed 183 Palestinian prisoners as the tenuous Gaza ceasefire ends its third week.

The withdrawal is part of a ceasefire deal with Hamas in which the sides are supposed to negotiate an extension that would lead to more hostages being freed.

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.