A US judge has asked federal prosecutors to investigate Uber Technologies Inc and one of its engineers for potential theft of trade secrets from Google, a media report said. The judge also determined the lawsuit Google filed against Uber would head to trial, dealing a blow to Uber’s strategy, The Wall Street Journal reported. This will heighten the stakes of a legal battle between Uber and Google parent Alphabet Inc over driverless-car technology. The judge late on Thursday temporarily blocked a limited part of Uber’s driverless car program, which Google alleges benefited from the stolen trade secrets. The motion issuing a partial injunction was sealed. As a result, the scope and details of the injunction – and how drastically it would curb Uber’s program – was unclear. Alphabet’s driverless-car unit, which Google recently renamed Waymo, had asked the judge to block much of Uber’s work on self-driving cars.