Hong Kong police arrested five Uber drivers and searched the ride-hailing app's office in the Asian financial center.
Police said Tuesday that officers posing as customers arrested the five drivers in an operation aimed at combating illegal taxis.
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Police said in a statement that the five men were suspected of illegally carrying passengers and driving without insurance.
Police did not name Uber Technologies but local Cable TV news showed officers inside the company's Hong Kong office and said they took away computers and documents.
It's the latest headache for the San Francisco-based company as its overseas expansion meets multiple legal and regulatory challenges.
In a statement, Uber said it stands by its drivers "100 percent."