A woman was arrested Thursday night, after police say she shoved an elderly woman off an elevated Muni Metro platform in what appears to be an unprovoked attack.

Police say that the incident occurred at 8:20 a.m., on a Muni platform on the 4800 block of Third Street, which is where Third crosses Oakdale Avenue.

According to the San Francisco Police Department, an 81-year-old woman was standing on the Muni platform when a 51-year-old woman approached her from behind and shoved her onto the tracks.

There was no exchange between the victim and the suspect before the assault, police say.

People who've been here a bit might be reminded of a similar incident from March of 2012, when a 57-year-old woman was injured after she was thrown off that same Muni platform by a group of five teenaged males. A single 15-year-old boy was arrested in that crime.

An arrest was made in Thursday's attack, too: Police say the shover was taken into custody at the scene. The victim, police say was transported to an area hospital with injuries police say are not life-threatening, and is expected to survive.

Update 11:50 a.m.: Via a press release sent to media, police provide more details from the case:

On August 31, 2017 at approximately 8:20 AM, Officers from Bayview Police Station responded to 3rd Street and Palou regarding a woman being pushed off of a Muni platform. Upon arrival, they found the victim, an 81 year-old female, San Francisco resident seated near-by. The victim suffered a head wound and was using a napkin to control the bleeding. Witnesses at the scene provided a suspect description and direction of escape. Witnesses also told officers that the suspect pushed the victim from the platform causing her to fall onto the roadway, hitting her head on the pavement.

Within minutes, a Bayivew officer assigned to a foot beat located and detained a person matching the suspect description at 3rd Street and Quesada Avenue. Through the course of an investigation, the victim and a witness positively identified the detained person as the suspect who had pushed the victim from the Muni platform.

The victim was transported to the hospital for treatment and was listed in non-life threatening status. The suspect, 51 year-old San Francisco resident Jacqueline Miller was booked at San Francisco County Jail for aggravated assault and elder abuse, both felonies. Due to the fact that Miller made statements that she assaulted the victim because of her ethnicity a hate crime enhancement was also charged.

While an arrest has been made, this remains an active and open investigation. Anyone with information is asked to call the SFPD Tip Line at (415) 575-4444 or Text a Tip to TIP411 and begin the message with SFPD.

Related: Man Thrown Into Bus On Market Street