The Chinese weapons have been found at the paramilitary militia RSF on several occasions, according to Amnesty International.
The discovery reveals "a blatant violation of the UN's arms embargo", the organization writes in a statement.
Several different types of Chinese weapons have also been identified through video and image analysis of RSF attacks.
Tens of thousands of people have been killed and around 13 million have been forced to leave their homes as a result of the war between the regular military and the RSF militia, which has been ongoing since the spring of 2023.
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