US officials on Tuesday added suspected online fraudster Nicolae Popescu to its most-wanted list of cyber criminals and put a price on his head.

A reward of as much as a million dollars is being offered for information that results in the capture or conviction of Popescu, who investigators believe may be in Europe.

A bounty capped at $750,000 is also being offered for information leading to the arrest and successful criminal prosecution of Dumitru Daniel Bosogioiu, a fellow Romanian identified as a co-conspirator in the cyber fraud with Popescu.

That fraud bilked millions of dollars from shoppers by posting fake listings for high-value items such as cars and boats online, according to the US Department of State.

Online shoppers were directed to wire payments to opened with bogus identification, then the money was transferred to leaders overseeing the scam from Romania, investigators said in a news release.

Popescu and Bosogioiu are wanted by the Federal Bureau of Investigation on charges including conspiracy to commit wire fraud, , and passport .

The FBI added Popescu to its Cyber's Most Wanted list which was started in 2013 to spotlight "egregious cyber crimes committed on a global scale."