Toronto police are seeking four men as witnesses after a video emerged that appears to show a taxi running a food-delivery service cyclist off the road.

Police received a call about the incident, which they are calling a personal injury collision, at about 5:48 p.m. ET last Thursday. It occurred on Bay Street north of Saint Mary Street.

A 57-year-old man was driving a 2011 Toyota Camry taxi northbound on Bay Street when the taxi allegedly struck a 31-year-old man riding a bicycle, police say. The cyclist, also northbound on Bay Street, suffered minor injuries.

A video of the incident surfaced on YouTube on Friday.

YouTube user RomanAtwoodVlogs posted the video, which shows a cyclist riding alongside a taxi before he slams one of its windows with his hand and gestures to him. A taxi horn can also be heard.

The events leading up to the collision aren't clear in the video, but what happens next appears to stop passersby in their tracks.

The taxi veers sharply toward the cyclist, knocking him off his bike and onto the ground, before coming to a standstill. The video cuts to the ground with someone yelling, "You saw that!" in the background.

The man filming the incident, then approaches the cyclist, who at this point is standing and asks him, "Are you all right? You OK?"

"Yeah," the cyclist responds before yelling at the cab driver, "You're going to jail! That is assault!"

Food delivery company 'extremely concerned'

Favour food delivery service confirmed the cyclist is one of its food runners, and issued a statement Saturday saying the safety of its employees is "a top priority."

"We are extremely concerned by the incident," public relations manager Tina Heileman said.

Heileman said the company is in close contact with the cyclist.

According to the city, the taxi driver is a private owner and operator. Ambassador Taxicab licences are issued by the city. CBC News has not been able to successfully contact the person holding the licence.

The city has the power to revoke the driver's licence, and while it hasn't yet done so, it isn't ruling out the option, spokesman Bruce Hawkins told CBC News in an email Monday. "Licence revocation is one possible outcome," he wrote.

"We only saw the dramatic end ... we don't know what led up to it," Const. Clint Stibbe said Monday. "We need to keep in mind that that video doesn't capture the entire incident — it gives us maybe a small glimpse as to what may have been happening,"

Toronto police are seeking four male witnesses after a video emerges that appears to show a taxi striking a cyclist and forcing him off the road. (RomanAtwoodVlogs/YouTube) Stibbe said police are looking to speak to witnesses and need to know the context of the incident capture on the video before determining what, if any, charges will be laid.

The YouTube user who posted the video did not respond to requests for comment.

Anyone with information is asked to contact police at 416-808-1900, or Crime Stoppers anonymously at 416-222-TIPS (8477).

Police say the four witnesses they're seeking are: