An Uber passenger says he called the police to report an erratic driver more than an hour before authorities allege the driver began shooting people at random, killing six and wounding two others before being arrested.

Matt Mellen told WWMT-TV in Kalamazoo that Jason Dalton picked him up at around 4:30 p.m. Saturday. He said Dalton introduced himself as "Me-Me" and that he sat in front, since Dalton had his dog in the backseat.

Mellen said about a mile into the trip, Dalton got a phone call and that when he hung up, he began driving erratically, blowing through stop signs and sideswiping cars.

"We were driving through medians, driving through the lawn, speeding along and when we came to a stop, I jumped out of the car and ran away," said Mellen. He said he called the police and that when he got to his friend's house, his fiancée posted a warning to friends on Facebook.

Authorities allege that Dalton shot the first victim outside of an apartment complex shortly before 6 p.m. and that he shot seven others over the next several hours. Dalton, 45, was arrested without incident early Sunday morning after a deputy spotted his vehicle driving through downtown Kalamazoo after leaving a bar parking lot.