(Hoy, keep in mind that the explosions set off by Persona were quite a bit aways from where most of the characters were at during the beginning. That means it would have been difficult for them to see or hear a loud explosion. Perhaps an echo, but that wouldn't set off much suspicion.)

[i]A large fleet of alien spacecrafts floated slowly through the stars of space. Armored and weaponized, these things were obviously meant for war, wars that more often than not had ended up favoring "them". The Altehokrinites, a race of supremacist, conquering aliens that destroyed and assimilated civilizations into their own empire. Large and hulking or small yet sleek, alone these reptilian-amphibian creatures were still a force to be reckoned with even without weapons.

One of them speaks.

"How goes it?"

Another at the controls responds.

"Well. The fool Starbird was completely unaware of the little device we planted in him years ago when he dared to journey outside earth to destroy one of our own ships. One of our hidden pawns on earth managed to pay off a rogue assassin for his death. When Starbird's life vanished, it activated the device, which in turn activated several hidden signals on satellites or even on our fallen ships being kept by these humans for study."

The aliens laughed and snarled in amusement. 

"And these signals are what's currently driving people, human and super alike, quite... unreasonable. Several explosions have followed in a mere hour after Starbird's death! With the powerhouse of the world, Arcus District, distracted by the chaos caused, we'll soon be able to launch our fleets on Earth once again..."[/i]