NEW : Internet addresses and information furnished by the FBI led to the teen . FBI believes China teen was the ringleader of the `` A-team '' Robert Mueller attacks cause $ 20 million in losses and theft , the FBI estimates . The FBI tracked down the teen and believes the 18-year-old , known by the cyber alias Symantec detected one bot-infested personal computers September .
NEW : Internet addresses and information furnished by the FBI led to the teen . FBI believes China teen was the ringleader of the `` A-team '' Robert Mueller attacks cause $ 20 million in losses and theft , the FBI estimates . Symantec detected one bot-infested personal computers September .