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			 An unnamed spokesman of the North's foreign ministry said there 
			would be "grave consequences" if Washington refused to agree to the 
			joint probe and continued to accuse Pyongyang, the official KCNA 
			news agency reported on Saturday. 
 On Friday, President Barack Obama blamed North Korea for the 
			devastating cyberattack, which led to the Hollywood studio 
			cancelling "The Interview", a comedy on the fictional assassination 
			of North Korean leader Kim Jong Un.
 
 In its first substantive response to the accusation, the isolated 
			North Korea said it could prove it had nothing to do with the 
			massive hacking attack.
 
 "We propose to conduct a joint investigation with the U.S. in 
			response to groundless slander being perpetrated by the U.S. by 
			mobilizing public opinion," the North Korean spokesman said.
 
 "If the U.S. refuses to accept our proposal for a joint 
			investigation and continues to talk about some kind of response by 
			dragging us into the case, it must remember there will be grave 
			consequences," the spokesman said.
 
			
			 
			Earlier, the U.S. Federal Bureau of Investigation announced it had 
			determined that North Korea was behind the hacking of Sony, saying 
			Pyongyang's actions fell "outside the bounds of acceptable state 
			behavior".
 Obama said North Korea appeared to have acted alone. Washington 
			began consultations with Japan, China, South Korea and Russia 
			seeking their assistance in reining in North Korea. {ID:nL1N0U32BR]
 
 Japan and South Korea said they would cooperate. China, North 
			Korea's only major ally, has yet to respond, but a Beijing-run 
			newspaper said "The Interview" was not a movie for Hollywood and 
			U.S. society to be proud of.
 
 "The vicious mocking of Kim is only a result of senseless cultural 
			arrogance," the newspaper said.
 
 It was the first time the United States had directly accused another 
			country of a cyberattack of such magnitude on American soil and set 
			up a possible new confrontation between longtime foes Washington and 
			Pyongyang.
 
 Obama said he wished that Sony had spoken to him first before 
			yanking the movie, suggesting it could set a bad precedent. "I think 
			they made a mistake," he said.
 
 "NOT CAVED IN"
 
 Sony Pictures Entertainment Chief Executive Michael Lynton insisted 
			the company did not capitulate to hackers and said it is still 
			looking for alternative platforms to release "The Interview." This 
			week, a spokeswoman for Sony had said the company did not have 
			further release plans for the $44 million film starring Seth Rogen 
			and James Franco.
 
 Despite Obama's stern warning to North Korea, his options for 
			responding to the computer attack by the impoverished state appeared 
			limited. The president declined to be specific about any actions 
			under consideration.
 
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			North Korea has been subject to U.S. sanctions for more than 50 
			years, but they have had little effect on its human rights policies 
			or its development of nuclear weapons. It has become expert in 
			hiding its often criminal money-raising activities, largely avoiding 
			traditional banks.
 The FBI said technical analysis of malicious software used in the 
			Sony attack found links to malware that "North Korean actors" had 
			developed and found a "significant overlap" with "other malicious 
			cyber activity" previously tied to Pyongyang.
 
 But it otherwise gave scant details on how it concluded that North 
			Korea was behind the attack.
 
 U.S. experts say Obama's options could include cyber retaliation, 
			financial sanctions, criminal indictments against individuals 
			implicated in the attack or even a boost in U.S. military support to 
			South Korea, still technically at war with the North.
 
 But the effect of any response would be limited given North Korea's 
			isolation and the fact that it is already heavily sanctioned for its 
			nuclear program.
 
 There is also the risk that an overly harsh U.S. response could 
			provoke Pyongyang to escalate any cyber warfare.
 
 Non-conventional capabilities such as cyber warfare and nuclear 
			technology are the weapons of choice for the impoverished North, 
			defectors said in Seoul.
 
			
			 
			They said the Sony attack may have been a practice run for North 
			Korea's "cyberarmy" as part of its long-term goal of being able to 
			cripple its rivals' telecommunications and energy grids.
 (Additional reporting by Matt Spetalnick, Roberta Rampton, Susan 
			Heavey, David Chance, Arshad Mohammed and David Brunnstrom in 
			Washington, Ju-min Park in Seoul; Editing by Raju Gopalakrishnan and 
			Crispian Balmer)
 
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