The family of the Oakland teen who was fatally stabbed by a white man at a BART station is planning on suing the public transportation system.

READ: News Station Receives Backlash For Using Picture Of Nia Wilson Appearing To Hold A Gun

Nia Wilson's family has filed a lawsuit through Arns Law Firm that alleges that "BART failed to meet the duty of common carriers to provide riders with the highest standard of care," according to KRON4. The suit also states that John Lee Cowell, the man who killed Nia and stabbed her sister Lahtifa, "should never have been permitted to enter the BART system, he should have been stopped at the turnstile on Sunday and on Monday, and his crime was foreseeable and preventable."

"The lawsuit will demand BART to take corporate responsibility by admitting that BART is not a safe place for any passenger, and admitting that BART will make necessary changes with BART security to protect the passenger," the law firm said.

Nia and Lahtifa were transferring trains at the MacArthur BART station in Oakland, California late Sunday when the attack took place. Cowell has been arrested since the incident. He was apprehended about a dozen miles from the Oakland station where the attack took place.

A memorial service for Nia will be held Friday, August 3 at 11 a.m. in Oakland.

Source: KRON4