Washington tries to tackle hackers behind Sony attack

By David Brunnstrom and Piya Sinha-Roy WASHINGTON/LOS ANGELES, (Reuters) - Washington made the woes of cyberattack victim Sony Pictures its own on Thursday as the White House acknowledged that the devastating strike against the big Hollywood studio was a matter of national security that would be met by a forceful government response. But the White House was not ready to put the blame on North Korea, despite a U.S. official's indication on Wednesday that Washington may soon formally announce the