Software giant Microsoft (Nasdaq:MSFT - news) had received anonymous tip-offs about the worm's creator and then contacted the Federal Bureau of Investigation and German police, Federau said. All three worked together to find the suspect.
Federau said the man, who he described as a highly intelligent "computer freak" living with his parents, was arrested on Friday near the central German town of Rotenburg but was no longer in custody.
Authorities did not know if the man had created all the versions of Sasser but said he had worked alone.
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