Hong Kong (CNN Business) Top drone maker DJI announced that it has fired some of its employees after uncovering fraud cases that could cost it tens of millions of dollars.

The private Chinese company, the world's biggest producer of consumer drones, said in a statement Monday that an internal investigation found employees had "inflated the cost of parts and materials for certain products for personal financial gain."

The incident raises questions about the financial management of one of China's best known technology firms, which sells billions of dollars of drones around the world each year.

DJI said in a statement it has contacted law enforcement officials about the case. The company also said it would strengthen its internal controls and establish "new channels for employees to submit confidential and anonymous reports relating to any violations of the company's workplace conduct policies" in the aftermath of the incident.

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