Nalleli Cobo was recognized with a Goldman Environmental Prize for her work against oil extraction sites in L.A. that she and community members claim were making them sick.
Ian Benjamin Rogers pleaded guilty to conspiring to destroy a building by fire or explosives, possessing an explosive device and possessing a machine gun.
The blast in the borough of Pottstown, northwest of Philadelphia, also left two people in critical condition, officials said. A cause is under investigation.
Vyvianna Quinonez was ordered to pay more than $30,000 in fines and restitution for the fight that started after she was asked to wear a mask and fasten her seatbelt.
Two senior federal law enforcement officials said the federal agents decided after about 30 minutes not to wait any longer and entered the school to find gunman Salvador Ramos.