India, April 19 -- The biological mother of Phoenix Ikner - the alleged gunman in the Florida State University shooting - launched into an angry social media rant just before her son was publicly identified as the suspect.

Phoenix Ikner, 20, was arrested on Thursday after allegedly killing two people and injuring six others in a violent shooting on the FSU campus.

Before authorities named him as the shooter, his birth mother, Anne-Mari Eriksen, posted a scathing message targeting Phoenix's father, Christopher Ikner. Court records reviewed by CBS News reveal that Eriksen and Christopher were embroiled in a custody battle that lasted more than 15 years.

The legal dispute began in 2007 and continued until 2023. During that time, Eriksen a...