By Clark Collis
August 22, 2016 at 09:15 PM EDT

As many readers will remember all too clearly, the Paris office of satirical weekly Charlie Hebdo was the subject of an horrific attack in January of last year during which two brothers, and Al-Qaeda members, killed 11 people and injured 11 others before also killing a French police officer. The incident sparked a massive manhunt for the killers and, over the next few days, an additional five people were murdered and 11 wounded.

That story has now been detailed in the new HBO documentary Three Days of Terror: The Charlie Hebdo Attacks. The film is directed by Dan Reed (an Emmy nominee for 2010’s Terror in Mumbai), who secured interviews with hostages, survivors, police, paramilitaries, as well as access to intelligence findings, evidence, and never before seen footage and photographs.

Three Days of Terror: The Charlie Hebdo Attacks premieres on HBO Sept. 19. See the film’s trailer above and poster below.