Uber resumed its autonomous car pilot program on Monday following an accident in Tempe, Arizona over the weekend. The ride-hailing app temporarily suspended the program in Pittsburgh, San Francisco and Arizona as authorities investigated the crash, the company announced.

The accident caused no serious injuries and involved only one Uber vehicle. A Tempe police spokeswoman told Business Insider that the Uber car was not responsible for the crash and the other vehicle was cited for a moving violation.

This isn't the first accident involving this new technology: A driver of a Tesla Model S car in autopilot mode was killed in a crash in Florida in 2016. And an autonomous vehicle operated by Google struck a bus last year in California.

Uber launched the autonomous cars in Pittsburgh in September and has used the technology to pick up passengers. However "safety drivers" are present because the vehicles still require frequent human intervention in many conditions or bad weather.

The company tried to launch a similar program in San Francisco in mid-December, but failed to get the proper license and the California DMV revoked the registrations of the company's 16 vehicles. Uber then sent its driverless cars to Arizona.