for the newshour, i'm john donvan, in maywood illinois. >> cornish: finally tonight, the oklahoma citying in 1995 was the largest act of domestic terrorism in u.s. history. a new documentary premiering tonight, on the pbs series" american experience," takes a fresh look at that traumatic event and what led to it. jeffrey brown has the story. >> there's heavy damage done. >> reporter: april 19, 1995. >> about a third of the building has been blown away. >> reporter: a ryder rental truck with 5,000 pounds of explosives ripped through the alfred p. murrah federal building in oklahoma city. 168 people were killed, 19 children among them. >> i knew very little of the story. i mean, i remember like a lot of people remember that day, and the image of that building, you know, with its face blown off and sort of, an image that we weren't used to or accustomed to at the time. >> reporter: barak goodman is the director of the film, "oklahoma city." >> while i think a lot of people remember this as a simple story of a lone terrorist committing an act, it actually has very deep roots. and when we p