[He pauses, closing his eyes and having a solemn breath slip out his mouth.]

Accidental. The explosion was a major lab accident in the city. Many people were hurt and worse through it all, including even those affected with mutations. [His voice is restrained, but still pained nonetheless. So many people died - it's such a sad waste of potential for people who could have been around for at least another several decades.] The gain of powers is only a small upside, but not entirely so. Many people have been using their new found power for ill gains. It's easy to do when there is no means to defend against these new circumstances for the every day people.