Hamas releases video of apparent 21-year-old hostage
A 21-year-old Israeli hostage appeared in a video released by Hamas on Monday.
Mia Schem's family confirmed to ABC News that she is the person who is speaking in the 78-second video.
It was not known when the video was filmed.
Schem's family was slated to hold a news conference Tuesday morning local time.
-ABC News' Christopher Looft and Ellie Kaufman