The head of France's network security agency said it was the biggest-ever hacker attack against the government.
Budget Minister Francois Baroin says it's too early to say who was behind the attack in recent weeks and months on Finance Ministry e-mail accounts and servers.
"It was the information about the G-20 that interested the hackers," Baroin said in an interview on radio station Europe-1.
France holds the rotating leadership of the G-20 this year and is hosting a series of meetings aimed at improving relations among the world's top economies, including the U.S. and China.
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