Peter Theo Curtis, who was held by Nusra Front, al Qaeda's official wing in Syria, said he had ** idea while he was imprisoned that there had been hundreds of people around the world pushing for his release. "I will respond, but I can't do it **w," said Curtis, who along with his mother Nancy Curtis raised a U.S. Their son's return came just days after rivals of Nusra Front, the militant group Islamic State, last week said it killed journalist James Foley and threatened a**ther still being held hostage, Steven Sotloff.