More than a year after the attack on satirical magazine Charlie Hebdo killed 12 people, and in the wake of other instances of horrific terror attacks in France, HBO will premiere its new documentary Three Days of Terror: The Charlie Hebdo Attacks. Directed by Dan Reed (Terror in Mumbai, Terror at the Mall), the documentary will dig into the lives of police, hostages, and others involved in the event with new interviews and footage, some of which appears in the trailer above. Three Days of Terror premieres on September 19 at 8 p.m. ET on HBO.