WASHINGTON—The State Department has assessed that Russia, China and Iran are mounting increasingly intense and coordinated disinformation campaigns against the U.S. relating to the outbreak of the new coronavirus, according to an internal report.

All three countries are using state-controlled media, social media and government agencies and officials to disseminate information to domestic audiences and global audiences alike that denigrates the U.S. and spreads false accounts, the State Department report says.

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