Dutch prosecutors may have landed a bigger Internet crime ring than first thought.

The Netherlands' National Prosecution Service told a court on Thursday that three suspects arrested earlier this month controlled some 1.5 million computers as part of a worldwide bot net, not 100,000 as first thought, stated an Associated Press report.

While security researchers have found evidence of the existence other million-bot networks, this may be the first well-documented case of such an extensive network of compromised PCs.

The arrests follow the August capture of two men--one from Turkey and the other from Morocco--suspected of creating and spreading the Zotob worm, a program that also compromised computers in order to create a bot net.