Authorities thwarted a planned mass shooting and bombing at a mall in Kelso, Washington, with the arrest of an Oregon juvenile who had detailed intentions to carry out the attack.

The teen accused of planning a mass shooting and bombing at a mall in Kelso appeared in a Columbia County court for the first time on Friday. While cameras were not allowed, both the defense and the prosecution revealed extensive new details about the suspect’s past and how the FBI was able to connect him to the alleged plot on Three Rivers Mall in Kelso.