Police released slowed-down surveillance video of a man running a turnstile.
The video shows him suddenly lifting up a knife and plunging it downward.
Just out of frame, police say a woman buying a MetroCard was stabbed in the back.
CBS2's Natalie Duddridge reports.
![Midmorning With Aundrea - August 31, 2020 (Part 1) [ENCORE PRESENTATION]](https://video.newsserve.net/300/v/20200831/7665173-Midmorning-With-Aundrea-August-31-2020-Part.jpg)
(Part 1 of 2. Originally aired August 12, 2020) The CDC has developed a new flea and tick repellent called Nootkatone, a naturally..
(Part 1 of 2) The CDC has developed a new flea and tick repellent called Nootkatone, a naturally occurring substance made of cedar..
