Hamas has raised concerns for the hostage at the center of the latest Gaza truce offer after losing contact with the captors following an Israeli strike. The Israeli-American hostage, Edan Alexander, was last seen alive in a video released by Hamas's military wing, in which he criticized the Israeli government. Hamas received a new truce offer from Israel that includes the release of 10 living hostages, starting with Alexander, in exchange for a 45-day ceasefire. The United Nations has described the humanitarian situation in Gaza as the worst it has been in 18 months of war.