UberX has emerged since as a rapidly growing element of Sydney's transport network.
A report by the Independent Pricing and Regulatory Tribunal (IPART) this month said ride-sharing services had been used by about 11 per cent of Sydney's population in the months since April,despite the government's insistence UberX is illegal.
A spokeswoman for Transport for NSW said:"Roads and Maritime Services executed a search warrant to Uber in April.
"Information may inform legal briefings,therefore no further comment can be provided at this time.
"Transport authorities are continuing enforcement activities and have issued 10 court attendance notices to drivers who had been providing services to UberX in Sydney."
Asked if this statement meant government officials raided the Uber offices,the spokeswoman said:"Yes,Roads and Maritime Services executed the search warrant at Uber's Sydney offices."
A spokeswoman for Uber would not comment on the search,other than to say that RMS has said that Uber does not break the law.