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More events followed as the scenario progressed , including a very cold winter in the Northern hemisphere , terrorist attacks on Saudi Arabian and Alaskan oil ports , and Al-Qaeda cells hijacking oil tankers and crashing them into the docking facilities at the ports ( which might effectively shut down such port for weeks , if not months ) .
 Saudi, Al-Qaeda
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Saudi, Al-Qaeda