A driver witnessed gunfire in Boston's Roxbury neighborhood this weekend, and police are using dashcam video of the incident as part of their investigation, officials said Monday.

A video posted to the Web showed the driver navigating through Boston when gunshots broke out. The headline of the video said the driver was using a GPS navigation service at the time.

The video shows the car heading up Dale Street when the occupants of the car suddenly hear gunshots. The driver stops the car and then puts it into reverse and drives off a side street. The video shows three men running down the sidewalk towards the car. Nobody was injured, police said.


"Oh, my God!'' an occupant of the vehicle said, while driving away.

Police said the incident took place around 6:22 p.m. Saturday near 38 Dale St. in Roxbury. The number of shots fired was not immediately clear, but police said they recovered four spent shell casings at the scene.

Area B-2 detectives, who are investigating, have been provided the video, police said.

The investigation is active and ongoing, and no arrests have been made.

Police Commissioner William B. Evans said Monday that the video demonstrates the problem of guns on city streets. Boston only had one killing in July, he said, but he said any violence is unacceptable.

"Oviously, this particular incident is troubling, and hopefully we can get to the bottom of it," the commissioner said.

Evans said the person who took the video was working with police. Investigators will examine the video to try to identify those responsible.

"I want to commend the vehicle owners for coming forward," he said. "and if we had more poeple come forward like that every day, our job would be a lot easier, and we would have some of the people who are responsible for firing these guns behind bars."


Andy Rosen of the Globe staff contributed to this article. John R. Ellement can be reached at ellement@globe.com. Follow him on Twitter @JREbosglobe.