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   The websites of a number of major US airports went black for a short time on   
   Monday after a cyber attack by a pro-Russian hacker group. The Ddos attacks   
   hit airport websites in several major cities including Atlanta, Chicago, Los   
   Angeles, New York, Phoenix and St Louis.   
       
   In a ddos attack, a website is taken offline by flooding it with data. The   
   airport websites were targeted after pro-Russian hacker group KillNet   
   published a list of sites. The group called on its followers to attack it. The   
   attacks only affected the public websites of the airports. These provide   
   flight and service information and do not affect operations.   
       
   KillNet last week claimed responsibility for attacks on a number of US   
   government websites. The collective is targeting other countries resisting the   
   Russian invasion of Ukraine. The US Cybersecurity and Infrastructure Security   
   Agency (CISA) did not immediately comment.   
      
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