Minneapolis police are asking for the public's help in identifying a motorist who threw chunks of concrete or bricks at bicyclists in at least two neighborhoods on Friday, leaving one man with serious injuries.

The attacks appeared to be random, police spokesman John Elder said Sunday night.

About 5:30 p.m. Friday, he said, two people were struck with cement-type material "within seconds of each other" near W. 41st Street and Bryant Avenue S. One person had minor injuries, but the second, identified on a GoFundMe page as Mackenzie Jensen, was struck in the face and suffered multiple facial fractures that will require two surgeries.

His jaw has been wired shut and he is expected to lose multiple weeks of work, the web page states.

A short time before that incident, the same motorist is believed to have thrown cement material at someone else in the city's Third Precinct, which Elder described as being east of Interstate 35 and south of Interstate 94. No one was hurt.

Elder said that the suspect was driving an older white Ford vehicle, possibly a Bronco, and he was wearing a glove. It is believed he threw the material with his left hand. The vehicle was missing a window, which was covered with a wood-like product, Elder said.

Anyone with information is asked to call CrimeStoppers at 1-800-222-TIPS (8477) or send an anonymous tip to CRIMES (274637) and begin the message with: TIP674. The Minneapolis police tip line is at 612-692-TIPS (8477).

The GoFundMe page is at www.gofundme.com/p9qgdzrg.