The Chinese Communist Party is believed to be responsible for newly found hack attacks on the U.S. government, businesses and American infrastructure, cybersecurity company Mandiant said Wednesday.

Why it matters: This is the third major cybersecurity breach to hit the U.S. in recent months — including two in March blamed on hackers linked to China’s government: one targeting 30,000 U.S. victims, including small businesses and local governments, the other hitting Microsoft.

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Driving the news: The U.S. Cybersecurity and Infrastructure Security Agency said in a statement Tuesday that the breach was “affecting U.S. government agencies, critical infrastructure entities, and other private sector organizations.”

Read more at Axios.