The Department of Justice is investigating Chinese telecom giant ZTE for bribery three years after the company pleaded guilty to violating U.S. sanctions on Iran and North Korea.

The investigations focus on potential bribes ZTE paid foreign officials to secure business deals around the world, according to NBC News. The Department of Justice recently ended ZTE’s two-year corporate probation period that the company agreed to as part of its plea deal in March 2017.

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