Police believe the suspect was part of an auto burglary.
SFPD says the officer was trying to take the suspect into custody when they were hit by the undercover vehicle, which had been called to the scene for backup.
[Ads /]
The suspect was taken to the hospital and is in life-threatening condition.
The officer was also taken to the hospital, but is not in life-threatening condition. Another officer at the scene told ABC7 News he's expected to be OK.
Details of how the police car struck the two are unclear at this time.
A second car burglary suspect was arrested in the incident.
Information about the initial alleged car burglary or how the suspects were identified as such has not been released.
In a video shot by a witness a man can be seeing laying on the ground behind an undercover police vehicle. According to the witness, the man was being chased by two other police officers moments earlier. San Francisco Police confirmed this information.
"They were chasing two auto burglary suspects. During that time they called for additional units and at that time an unmarked vehicle arrived on scene," said SFPD Public Information officer Joseph Tomlinson.
Officer Tomlinson said a plainclothes officer was chasing the suspect on foot before they were both struck by an unmarked police vehicle on Geary Blvd.
"That vehicle struck a police officer and the suspect. Those two were taken to the hospital," said officer Tomlinson.
Geary Blvd. was closed from Gough to Fillmore for several hours creating heavy traffic in the Japantown area.
[Ads /]
Further details are not available at this time.
Stay with ABC7 News for the latest details on this developing story.