The man who ran security at 1984 Los Angeles Olympics and the 1996 Atlanta Games — where a bomber killed two and wounded more than 100 — warns that Iranian “sleeper cells” are likely plotting attacks during next month’s World Cup, as federal officials race to secure the 39-day competition. “I’m fairly confident there are Iranian sleeper cells or surrogate sleeper cells, and this would be an incredible opportunity for sleeper cells to attack,” Former LAPD Deputy Chief Bill Rathburn told The Post.