The group is alleged to have infiltrated more than one million computers and skimmed millions of dollars from people's bank accounts.
The teenager, who is 18, cannot be named for legal reasons but was known by an alias as "Akill".
He was detained as part of an FBI crackdown on hi-tech criminals who run botnets - networks of hijacked PCs.
Global crackdown
After being questioned "Akill" was released without charge, but police say he is still being investigated.
Police allege that he was responsible for setting up a global network of hijacked PCs - known as a botnet.
The term describes the process of installing malicious software on PCs around the world to collect information such as login names, bank account details and credit card numbers.
The FBI estimates that 1.3 mi... More »
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