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Artificial intelligence is an 
 threat. So says a U.S. report, which painted a worst-
-scenario "extinction-
 threat" to humanity. It identified a "growing 
 to national security". The report said there was a "clear and urgent 
" for the 
 to intervene "quickly and 
". It said AI could destabilise global 
, "in ways 
 of the introduction of nuclear weapons". It called for the 
 of AI companies.