The San Francisco Police Department closed a stretch of Union-Square area street for nearly three hours Tuesday morning, on reports of a shooting on the block.

ABC 7 reports that O'Farrell Street between Cyril Magnin and Mason streets was closed early this morning to investigate a "possible shooting."

According to tweets from the SFMTA, the street closure began at around 6:43 this morning.

While the 30, 38, and 45 were initially reported to have been rerouted through the area... 6:56, the transit agency says that they were notbeing rerouted, but riders should expect delays.

According to the Chron, an area ShotSpotter detected gunfire at 6:26 this morning. SFPD oficers who responded to the alert "found a man slumped over in the front seat of a badly damage silver Nissan Infiniti, suffering from a gunshot wound."

Elliott Urbina, 30, of Fairfield, said he was driving his black BMW in the area and had just made a left turn onto O’Farrell street from Mason, when he was sideswiped by the silver Infiniti he estimated was going about 40 mph.

“The person was driving super, super fast,” said Urbina, who was not injured in the crash.

Urbina said the collision sent his car barreling into white delivery truck.

Initial reports suggest that the shooting occurred before the wreck, and that a woman driving the car was attempting to get the critically injured man the hospital.

“When the accident happened, she jumped out of the car and was pleading for help,” Urbina said.

“My husband’s been shot. My husband’s been shot,” another witness to the scene says the woman was screaming following the crash.

According to the SFMTA, the investigation wrapped up at 9:20 this morning, and traffic resumed in the area.

As of publication time,police had not announced any arrests in the incident, nor had additional information on the shooting been released.