San Francisco-area straphangers are on edge Tuesday following the third homicide on Bay Area Rapid Transit in less than a week.

“Maybe I should start driving to school, because I don’t think I feel safe as a BART commuter anymore. But then again, I’m a woman of color. Am I safe anywhere? My car? On campus? At an event? Walking my dogs?” @keani_yafreak tweeted.

The most recent attack, on Sunday night, left 18-year-old Nia Wilson dead, and her sister, Latifa, seriously injured when a madman attacked them with a knife at the MacArthur Bay Area Rapid Transit station, according to BART officials.

“It was probably one of the most vicious attacks that I’ve seen,” BART Police Chief Carlos Rojas said during a Monday press conference.

John Cowell, 27, is now in custody for the slashing thanks to an anonymous tip, according to authorities. Cowell is white, while his victims are black; authorities have not ruled that race was a factor in the attack.

The two other attacks are also being treated as homicides.

On Saturday, a 47-year-old transient was declared brain-dead after being punched in the side of the head on the platform of the Bay Fair Station in San Leandro. The suspect is still at large, officials said.

And on Friday, 51-year-old Gerald Bisbee of Pittsburg, Calif., died from an infection from cuts he sustained cuts when a 20-year-old stranger attacked him after the two argued Wednesday at the Pleasant Hill Station in Walnut Creek, authorities said. Police busted Abdul Bey in connection with the attack, KRON4 reported.

“All this s–t happening at BART, I’m real life scared to ever take my son on it, you never know what’s [going to happen],” commuter @leti__dgaf tweeted.