Families Of US Hostages Left Behind Plead For Help

Christine Levinson (right), wife of former FBI agent Robert Levinson, watches as her son Daniel Levinson displays a web print of his father's picture to journalists while attending a news conference at Switzerland's embassy in Tehran December 22, 2007.
Christine Levinson (right), wife of former FBI agent Robert Levinson, watches as her son Daniel Levinson displays a web print of his father's picture to journalists while attending a news conference at Switzerland's embassy in Tehran December 22, 2007.

Families of Iran’s hostages not included in the US prisoner swap deal have called on Washington for an explanation on the fate of their loved ones.