An illustration picture shows the logo of car-sharing service app Uber on a smartphone next to the picture of an official German taxi sign Thomson Reuters MEXICO CITY (Reuters) - Mexico City could become the first city in the world to limit the number of Uber cars, draft regulation shows, in the latest potential hurdle for the ride-hailing service that has spurred a regulatory backlash around the globe.

The San Francisco-based company would also have to use vehicles costing a minimum of 250,000 pesos ($15,883) that are no more than seven years old, according to the draft plan drawn up by the Mexico City government seen by Reuters on Friday.

A Mexico City government official working on the regulation confirmed the details of the document, which was drafted on Thursday and is expected to be finished next week. The official noted that details of the draft are still being negotiated.

Uber said it could not comment since it has not seen the draft, which does not specify the car limit, leaving the number to the Mexico City transport ministry's discretion.

Regulation by Mexico City would be the first for Uber in Latin America and is also set to apply to other ride-hailing apps such as Cabify.

Uber's public policy chief Corey Owens said this week in an interview he strongly opposed limiting its fleet of cars.

"Imposing some arbitrary cap on the number of vehicles would simply create the same problems that Mexico City residents have suffered in the existing taxi industry," he said.

Owens said no city has imposed a cap on the number of Uber cars in circulation to date.

(Reporting by Max de Haldevang; Editing by Dave Graham, Bernard Orr)