| A 
				Defence Ministry spokesman said the ministry would not comment.
 El País said the virus was apparently introduced via email and 
				was first spotted at the beginning of March. However, it could 
				have gone undetected for months in an intranet with more than 
				50,000 users.
 
 Although the network does not carry classified information, the 
				paper said its sources were concerned about a wider infection to 
				other networks with the purpose of accessing information related 
				to secret military technology.
 
 The investigation had yet to determine who was responsible for 
				the cyberattack, but sources told El País it was too technically 
				complex to be done by standard hackers. "There is a state behind 
				it," they said.
 
 (Reporting by Jose Elias Rodriguez; Editing by Axel Bugge and 
				Frances Kerry)
 
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