Possible Austin school shooting thwarted by law enforcement, court documents say

AUSTIN (KXAN) -- Authorities arrested a 17-year-old girl this week and accused her of making online threats against a northeast Austin elementary school, according to the suspect's arrest affidavit.

The FBI received a tip about an Instagram user, later identified as 17-year-old Giana Castillo, "making concerning statements online... regarding the planning of an active shooter event," at Graham Elementary School. FBI agents tracked the IP address of the account to Castillo.

While analyzing the account...