it s been torture. i m not eating, not sleeping. i m just worried about getting my little boy back. reporter: ian ritch says he lost the boy saturday at this park west of charlotte, when he was there with a woman police are refusing to identify. he says his son went chasing after a jogger and he couldn t catch him because of a medical condition that makes it difficult for him to run. i feel guilt for letting him get so far ahead of me before i started running after him. reporter: police are releasing the calls for help. it s been almost an hour now. we searched everywhere. reporter: the fbi has now brought out a special dive team to now search the lake. david? steve osunsami tonight. steve, thank you. when we come back here tonight, we are tracking severe thunderstorms on the move at this hour, from d.c. up through philly, new york to boston. travel worries tomorrow. rob is standing by with the track.