The driver told police he pulled over, jumped out of the car and fired four rounds at the suspects as they ran through the parking lot.
"We're not supposed to be carrying guns," said J'Gai Starks, an Uber driver who was not connected to this incident.
Starks says he usually feels pretty safe but he knows drivers who take extra precautions.
"Some people I know don’t pick up in certain areas of Milwaukee so they’ll just turn their app off until they get to where they want to be," he said.
Starks says in nearly two years of driving, he's never had a passenger threaten him, but he knows other drivers might view situations differently.
"I don’t know what it’s like for people with different life experiences than me," he said. "I might be too trusting of people naturally."
Both Uber and Lyft have a strict no firearms policy for passengers and drivers.
On its website, Lyft says, "We approach this issue from a community perspective — it’s hard to know what someone else is or isn't comfortable with. the mere presence of a weapon might make another community member distressed."