(CNN) A Russian citizen accused of online fraud involving millions of dollars has been arrested in Varna, Bulgaria, on a warrant issued by the United States and is awaiting extradition proceedings, according to a statement by the Varna District Court issued Thursday.

A US Justice Department spokeswoman declined to comment on the arrest.

"As a matter of longstanding policy, the US Department of Justice generally does not comment on extradition-related matters until a defendant is in the United States. There is nothing public at this time," US Justice Department spokeswoman Nicole Navas Oxman told CNN.

The Russian citizen, named by the court as 38-year-old Alexander Zh., with the last name abbreviated, has been accused of electronic fraud and a conspiracy to commit computer fraud which resulted in damages of at least $7 million.

The defendant and his accomplices are accused of tricking advertisers into making payments for fake online traffic to their websites and ads, which was generated by software that they created to resemble real users browsing the internet.

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