WASHINGTON--A Ukrainian and an Estonian were among three people charged in a scheme to hack into a computer system of a US restaurant chain to steal credit card data, the Justice Department said Monday.

An unsealed indictment alleged the three hacked into cash register terminals at 11 Dave & Buster's restaurants at locations around the United States to get credit and debit card information, which was sold to make fraudulent purchases. The losses were estimated at $600,000.

A 27-count indictment returned in Central Islip, New York, charges Maksym Yastremskiy of Ukraine and Aleksandr Suvorov of Estonia with wire fraud conspiracy and related charges.

A separate complaint charges Albert Gonzalez of Miami with wire fraud conspiracy related to the scheme.

Authorities said that starting last May, Yastremskiy and Suvorov gained access to cash register terminals and installed at each restaurant a 'packet sniffer,' or computer code designed to capture communications between two or more computer systems on a single network.

Using this, the scheme captured information from at least 5,000 credit and debit cards.

Turkish officials arrested Yastremskiy in July 2007, and he remains in a Turkish jail on potential violations of Turkish law. US officials have made an extradition request.

At the request of Washingtom, Suvorov was arrested in March by German officials and remained held pending extradition. US Secret Service officials arrested Gonzalez in Miami.

Assistant Attorney General Alice Fisher, said: "The Department of Justice will be vigilant against these online hacker schemes that harm the integrity of the marketplace and victimize the public."