A movie billboard is displayed behind a Sony Pictures Entertainment Studio entrance in Culver City, Calif., Thursday, Dec. 18, 2014.  Companies across the globe are on high alert to tighten up network security to avoid being the next company brought to its knees by hackers like those that executed the dramatic cyberattack against Sony Pictures Entertainment.  (AP Photo/Damian Dovarganes)

WASHINGTON (AP) — Suspicions that North Korea was behind a destructive hacking attack against Sony Pictures and a threat against movie theaters are intensifying calls for tougher U.S. steps to cut that country’s access to hard currency and declare it once more as a state sponsor of terrorism.

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