It's been two years since the sarin gas attack in Syria that killed an estimated 1,429 civilians -- including 426 children -- a crime for which no one has been held accountable.
By the end of Scott Pelley's story "A Crime Against Humanity," which shows in disturbing videos many of the deaths that took place that day, the question of who ordered the attack is left unanswered.
In a discussion about his story, Pelley tells 60 Minutes Overtime:
"As journalists we can't come to that conclusion...There isn't a great deal of doubt about how all of this happened, but we try to lay all of that out in the story and let the audience come to their own conclusions."
It's also a question Charlie Rose tried to answer when he traveled to Syria in 2013 to interview President Bashar al-Assad.
In that interview, which occurred less than a month after the August 21 attack was carried out, Rose asked Assad: "Do you approve of the use of chemical warfare?" and "Why do you have such a stockpile of chemical weapons?"
Watch the video in the player above to hear Assad's response.
"Why would you launch the biggest chemical massacre in decades when you've got chemical weapons inspectors sitting in your capital city? Doesn't seem to make sense. Did Assad order the attack? Maybe one day we'll find out."
Two years later, we still aren't any closer to finding out who gave the go-ahead on the attack. As Pelley reported this week, the question is further clouded by the fact that there were weapons inspectors in Damascus when the attack took place.
"Why would you launch the biggest chemical massacre in decades when you've got chemical weapons inspectors sitting in your capital city?" Pelley wonders. "Doesn't seem to make sense. Did Assad order the attack? Maybe one day we'll find out."
Editor's Note: This 60 Minutes Overtime video featuring Charlie Rose's 2013 interview with Bashar al-Assad was produced by Susan Bieber and Sarah Shafer. It was originally published in April 2015.