MIAMI -

A law firm representing an 82-year-old woman who was pulled off Miami-Dade County Metrorail train by a private security guard is filing a lawsuit on her behalf.

The Carbonell Law Firm announced the lawsuit on behalf of Emma Anderson in a news release Tuesday. A news conference is scheduled for 4 p.m., where copies of the lawsuit would be handed out.

Cell phone video taken Feb. 20 showed a 50 State Security Service guard pull Anderson off the Metrorail train because she was singing a spiritual hymn. Her attorney filed a Freedom of Information Act request for Miami-Dade Transit's policies and procedures when dealing with the elderly.

The president of the security company wrote a letter to Miami-Dade County Mayor Carlos Gimenez, assuring him a thorough review into the incident would be completed.

The North Miami-based company received the county's $72 million transit security contract about four years ago.

The man has an excellent record as a security guard, according to the county. He has since been reassigned.