Taxi-hailing company Uber has suspended its service in Abu Dhabi, the capital of the United Arab Emirates.
Rival service Careem has also put its service there on hold, after some of its cars were stopped by authorities.
Uber, which has been operating in the Emirates since 2013, did not explain why it had suspended its service, but did say the move was "temporary".
Reuters news agency reported that some Uber drivers had been detained for not meeting regulations.
In a statement Uber said: ""This is a temporary suspension and we will let you know of any further updates."
Both Careem and Uber said that services in neighbouring Dubai were operating as normal.