    Sentence fs The U.S. government and. private  technology experts warned @cdnesday that  backers plan to attack thousands of Mcb sites  Sunday in a loosely co-ordinated " contest,”  that could disrupt Internet traffic .    Sentence 21 THE US government and. private  technology experts bave warned. that hackers  pen to attack thousands of websites. on  sunday in a loosely co-ordinated ” contest”  that could disrupt Internet traffic .