Authorities have not been able to determine the identity of a woman who was struck Tuesday by a police cruiser traveling in reverse on a pedestrian-and-vehicle path in Kensington, a police spokesman, Capt. Sekou Kinebrew, said.

The incident was one of three cases over the last four days involving Philadelphia police officers that remain under investigation.

According to police, two officers were conducting an investigation in McPherson Square on the 3000 block of F Street around 4:25 p.m. when the officer who was driving the cruiser put it in reverse and struck the woman.

The officers placed the victim — who appeared unconscious in witness videos obtained by 6ABC — into the police car and transported her to Temple University Hospital, where she remains in critical condition.

Kinebrew said the woman, believed to be in her 30s, did not have an identification card on her and her identity remains unknown. Authorities are working with the hospital to determine her identity, he said.

It's unknown what the woman was doing behind the police car or why the officers did not see her in their rearview mirrors. Kinebrew said the department's Accident Investigation Division is investigating the case.

Police declined to release the nature of the initial investigation that led the officers to the square because it remains ongoing. However, Kinebrew said the woman was "absolutely an innocent bystander" and not part of the investigation.

The officers involved have not been placed on desk duty, Kinebrew said.

Philadelphia police are also investigating their own in two other cases.

In one, Bucks County authorities are taking the lead in a case out of Northampton Township involving an off-duty Philadelphia officer who allegedly shot her husband in the driveway of their home Tuesday morning. The Philadelphia Police Department's Internal Affairs Unit is conducting its own investigation into the officer's actions.

Internal Affairs is also investigating the pursuit of a dirt bike by Philadelphia police on Saturday that led into Upper Darby, where the dirt-bike rider allegedly struck and critically injured a 6-year-old girl and her aunt.

Kinebrew did not immediately know the duty status of the officers involved in the Northampton and Upper Darby incidents.