By Dan Williams JERUSALEM (Reuters) -Hamas aired video on Sunday showing three Israeli hostages it is holding in Gaza in which they urged their government to stop the offensive against the Palestinian Islamist group and bring about their release, as both sides marked the 100th day of the war. The undated 37-second video of Noa Argamani, 26, Yossi Sharabi, 53, and Itai Svirsky, 38, ended with the chyron: “Tomorrow we will inform you of their fate.” Hamas said earlier on Sunday it had lost contact with some hostages as Israeli forces shelled Gaza, noting that they might have been killed in the p…