Police arrested two girls at Richardson High School for writing threatening graffiti in a school bathroom.
A student shared with FOX 4 a picture of the alleged threat about a school shooting that would happen on Thursday at the Richardson High School.
The school was on lockdown while police officers and the Richardson ISD security team investigated. They determined a 15-year-old and 16-year-old student made the threats.
The girls were charged with making a terroristic threat.