Hamas has claimed its youngest hostage - a 10-month-old boy - has been killed along with his four-year-old brother and their mother.
Shiri Bibas and Kfir and Ariel Bibas were taken during the terror attack on Israel in October and were the highest-profile civilian hostages yet to be freed.
The only instance of this I can recall off the top of my head is PIJ claiming that Hanna Katzir was killed. Hamas have not publicly announced the death of any hostages in ways that have been confirmed or reported by respectable journalists, but there is lots of propaganda being spread through Telegram and other platforms.