he son of a founder of the Palestinian militant group, Hamas, Tuesday told CNN that he was a spy for Israel.

For 10 years, Mosab Yousef said he gathered information about Hamas terrorist plots and fed them to Israel's domestic security service Shin Bet.

Yousef, in an exclusive interview with CNN's Christiane Amanpour, said he did it because he came to believe that Hamas was practicing "exceptional cruelty" against its members and "killed people for no reason."