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Federal investigators in the United States and Europe last week arrested nearly three-dozen people suspected of patronizing so-called “booter” services that can be hired to knock targeted Web sites offline. The global crackdown is part of an effort by authorities to weaken demand for these services by impressing upon customers that hiring someone to launch cyberattacks on your behalf can land you in jail.

On Dec. 9, 2016, the U.S. Federal Bureau of Investigation (FBI) arrested Sean Sharma, a 26-year-old student at the University of California accused of using a booter service to knock a San Francisco chat service company’s Web site offline.

Sharma was one of almost three dozen others across 13 countries who were arrested on suspicion of paying for cyberattacks. As part of a coordinated law enforcement effort dubbed “Operation Tarpit, ” investigators here and abroad also executed more than 100 so-called “knock-and-talk” interviews with booter buyers who were quizzed about their involvement but not formally charged with crimes.

Stresser and booter services leverage commercial hosting services and security weaknesses in Internet-connected devices to hurl huge volleys of junk traffic at targeted Web sites. These attacks, known as “distributed denial-of-service” (DDoS) assaults, are digital sieges aimed at causing a site to crash or at least to remain unreachable by legitimate Web visitors.

“DDoS tools are among the many specialized cyber crime services available for hire that may be used by professional criminals and novices alike, ” said Steve Kelly, FBI unit chief of the International Cyber Crime Coordination Cell, a task force created earlier this year by the FBI whose stated mission is to ‘defeat the most significant cyber criminals and enablers of the cyber underground.’ “While the FBI is working with our international partners to apprehend and prosecute sophisticated cyber criminals, we also want to deter the young from starting down this path.”

According to Europol, the European Union’s law enforcement agency, the operation involved arrests and interviews of suspected DDoS-for-hire customers in Australia, Belgium, France, Hungary, Lithuania, the Netherlands, Norway, Portugal, Romania, Spain, Sweden, the United Kingdom, and the U.S. Europol said investigators are only warning one-time users, but aggressively pursuing repeat offenders who frequented the booter services.