Denise Tyrell, the Metorlink spokeswoman who announced that an Engineer’s mistake caused the deadly Chatsworth train crash has resigned. Tyrell’s statement was considered premature by the Metrolink board. The National Safety Transportation Board announced on Sunday that it was indeed an engineer’s mistake which lead to the deadly train crash just north of Los Angeles.

Investigators are now looking into the possibility that the engineer who is being blamed for the crash may have been sending text messages immediately prior to the crash.