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A team of suspected Chinese hackers has infiltrated US software developers and law firms in a sophisticated campaign to collect intelligence that could help Beijing in its ongoing trade fight with Washington , Google-owned cybersecurity firm Mandiant said Wednesday.

The hackers have been rampant in recent weeks, hitting the cloud-computing firms that numerous American companies rely on to store key data, Mandiant said. In a sign of how important China’s hacking army is in the race for tech supremacy, the hackers have also stolen US tech firms’ proprietary software and used it to find new vulnerabilities to burrow deeper into networks, according to Mandiant.

The FBI is investigating the intrusions and US officials are still trying to unders

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