Surveillance video from a Western Addition corner store might be the undoing of a woman suspected of robbing a tiny 8-year-old as the child sold candy for a school fundraiser.

According to San Francisco Police Department spokesperson Officer Gordon Shyy, the girl was selling candy with two other children outside a store near Divisadero and Eddy streets at around 1:45 p.m. Monday.

When the other children entered the store and left the 8-year-old outside, the suspect, described as an African-American woman between the ages of 40 and 50 wearing a black shirt and orange skirt, approached the child and asked her to make change for Muni fare, Shyy says.

"She ended up grabbing the child's arm, twisting until she let go of the bag of money, then fled on the Muni 24 line," Shyy says.

The store's owner tells KTVU that just before the robbery, the suspect was inside the store, trying unsuccessfully to purchase a $1.25 can of beer and eyeing the kids' earnings.

That's when she was caught on the surveillance video, which you can see below in this KTVU news segment.

According to the SFMTA, the transit agency is also pulling surveillance video from Muni's 24 line in an effort to determine where the suspect got off the bus.

"It's not something that we see too often where an adult would prey upon a young person and rob them," Shyy told KTVU.

"So it is alarming and we definitely want to bring this person into our custody."

[KTVU]