The falling panels were not a intentional Terrorist Attack, it was the side effect of one where the Spoiler: Here's part of the plot-line for Season 2 of Gundam 00 The Free-Electron Laser named "Memento Mori" mounted to the lower Orbital Ring was being used by the A-Laws, a Autonomous "Peace Keeping" force ran by the ESF (Earth Sphere Federation) which is the defacto World Government that has control over the Orbital Ring, Orbital Elevators, & all the Solar Power generated by the Solar Panels on the Outer Orbital Ring. The A-Laws were battling the rebel faction Katharon, who were opposed to the ESF and formed by many ex-military members from the previous 3 Major SuperNational PowerBlocs, who gathered together as a Anti-Authoritarian Government Resistance Group known as Katharon. The A-Laws were planing on using "Memento Mori" to wipe out Katharons bases on Earth by blasting them from orbit and has used the same laser to destroy the half of Katharon's 1st Space Fleet. Luckily "Celestial Being", the neutral and independent Armed Para Military group and the shows Protagonists was there to destroy the Super Weapon known as "Memento Mori". Break Pillar Incident Second Memento Mori However, that wasn't the only "Memento Mori" FEL in operation, there was a second unit hidden on the Oribtal ring that was part way through construction and months later, it was revealed and brought into operation. During the Federation Army's coup d'état attempt, in which the dissidents occupy the AEU's orbital elevator, La Tour, the A-Laws unveil another Memento Mori to destroy the elevator's low orbital station. Setsuna and Saji Crossroad sortied against the second Memento Mori in the 00 Raiser and tried to destroy it with the Raiser Sword. However, the attack only severely damaged the cannon, and it managed to fire and caused parts of the orbital elevator to collapse. Four months later, the repaired cannon was destroyed by 00 Raiser.