SEOUL: North Korean hackers tried to break into the computer systems of pharmaceutical giant Pfizer in a search for information on a coronavirus vaccine and treatment technology, South Korea's spy agency said Tuesday, according to reports.

The impoverished, nuclear-armed North has been under self-imposed isolation since closing its borders in January last year to try to protect itself from the virus that first emerged in neighboring China and has gone on to sweep the world, killing more than two million people.

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