Eight of the remaining hostages set to be released by Hamas in the first phase of a ceasefire agreement with Israel are dead, according to an Israeli government spokesperson.

The Palestinian Islamist group Hamas has handed over to mediators a list showing that 25 Israeli hostages are still alive, out of 33 scheduled for release, an official of the group told Reuters on Monday.

Israel says a Hamas list shows that eight of the 33 hostages to be released in the first phase of the Gaza ceasefire are dead.