San Francisco

UBER Technologies Inc's criminal background checks for drivers failed to prevent it from hiring registered sex offenders, identity thieves, burglars, a kidnapper and a convicted murderer, California prosecutors said.

The district attorneys of San Francisco and Los Angeles escalated their fight with the ride-share service on Tuesday in a revised lawsuit that faults the company for giving the public false assurances that its drivers are safe. The criminal histories of some drivers didn't come to light until they were cited for violations while picking up airport passengers or street hails, the officials said.