Jason Dalton was arraigned on six counts of murder, two counts of assault with intent to commit murder, and eight felony firearm counts in connection with a shooting spree that left six people dead on Saturday night in Kalamazoo, Mich., according to a report by USA Today.

Police say Dalton, who was working as an Uber driver, randomly shot victims at three locations between fares, according to the report. The attacks started at 6 p.m. when police say Dalton shot a woman four times at an apartment complex parking lot. She is currently in critical condition.

Later in the evening, police say Dalton shot and killed a son and father at a Kia car dealership and killed four people in a Cracker Barrel parking lot, says the report.

Uber said that Dalton passed a background check, and Dalton had no criminal record, according to the report.

In response, Uber’s Chief Security Officer Joe Sullivan posted this statement on Uber’s website: “We are horrified and heartbroken at the senseless violence in Kalamazoo, Michigan. Our hearts and prayers are with the families of the victims of this devastating crime and those recovering from injuries. We have reached out to the police to help with their investigation in any way that we can.”

Click here for the full USA Today report.