Seven others -- two in the Netherlands and five in the United States -- were arrested but have not been charged.

The arrests are the culmination of a two-year investigation, code-named Operation Adam Bomb, led by the Drug Enforcement Administration's Los Angeles Field Division. Law enforcement officials in several U.S. states, the Netherlands, and Colombia cooperated.

"Today's action should send a clear message to organizations that are using technology to conduct criminal activity that the DEA and our law enforcement partners will track them down and bring them to justice," said Briane M. Grey of the DEA.

The IDG News Service