Uber CEO Dara Khosrowshahi, ]right], and the Board ceased self-driving operations in US and  Canadian cities immediately

Khosrowshahi also acknowledged the incident on Twitter:

Uber has paused self-driving operations in Phoenix, Pittsburgh, San Francisco and Toronto, which is a standard move, the company says.
The police investigation is still active, and the National Transportation Safety Board [NTSB], also tweeted, Monday that they will be sending investigators to Tempe.
Uber began testing self-driving cars in Tempe in February 2017.
The fleet of self-driving Volvos arrived in Arizona after they were banned from California roads over safety concerns. Gov. Doug Ducey touted Arizona as a testing ground, saying at the time in a written statement, “Arizona welcomes Uber self-driving cars with open arms and wide open roads.”
One of the self-driving cars was involved in a crash in March, 2017, a month later. A car failed to yield to the Uber vehicle and hit it, authorities said. The self-driving SUV rolled onto its side as a result crash.
There were no serious injuries were reported in that crash.