The online private car companies Uber and Careem suspended their services in Abu Dhabi at the weekend after drivers were arrested by police.

As many as 50 drivers were held at a police station, and one driver was told 70 cars had been impounded.

“One of our drivers was put in jail at the weekend and it’s happened with loads of drivers from other limousine companies as well,” said an operations manager whose company provides limousine services to Uber and Careem.

Uber and Careem, which were launched in Abu Dhabi in 2013 and work via mobile apps, are allowed to use only licensed drivers from the 18 registered limousine companies, must price their services in line with limousine services and cannot compete directly with the city’s taxi companies.

The arrests led some limousine firms to stop providing services to Uber and Careem, crippling their operations.

“There were rumours that about 70 cars were seized and taken to [the vehicle impound centre at] Al Wathba.”

An Abu Dhabi police spokesman declined to comment.

“A number of the limousine companies we work with had their drivers stopped, with the result being that the companies decided to go offline on Saturday out of nervousness and lack of clarity,” said Christian Eid, Careem’s marketing vice president in Dubai.

An Uber spokesman said the company hoped to resume operations in Abu Dhabi soon, and it would have more information in the next two days.

Mohamed Al Qamzi, general manager of TransAD, the Abu Dhabi taxi regulator, said Uber and Careem had on occasion offered trips at a lower price than licensed limousines, in contravention of regulations.

“They are bringing customers to limousine companies, which we encourage, but they don’t have the freedom to set prices where they are in competition with the taxis.”

TransAD announced plans in May for stiffer penalties for illegal taxi drivers, with fines of Dh30,000 and deportation