As Mariupol came under Russian attack, Ukrainian AP video journalist Mstyslav Chernov and his colleagues risked their lives to show the world the truth of the war — including the bombing of a maternity hospital. Watch an excerpt from "20 Days in Mariupol," Chernov’s documentary with FRONTLINE and AP.

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The award-winning documentary “20 Days in Mariupol” follows Chernov as he and his Ukrainian AP colleagues become trapped in the besieged city of Mariupol, struggling to continue their work documenting atrocities of the Russian invasion. The last international journalists remaining in the city as Russian forces close in, Chernov, photographer Evgeniy Maloletka and field producer Vasilisa Stepanenko captured what become some of the most defining images of the war: dying children, mass graves — and the maternity hospital bombing.

Watch the full documentary on PBS and online Tues., Nov. 21: https://to.pbs.org/3sRHEsm

"20 Days in Mariupol" is a FRONTLINE production with The Associated Press. The director, cinematographer and writer is Mstyslav Chernov. The field producer is Vasilisa Stepanenko. The still photographer is Evgeniy Maloletka. The editor is Michelle Mizner. The composer is Jordan Dykstra. The producers are Mstyslav Chernov, Michelle Mizner, Raney Aronson-Rath (FRONTLINE’s editor-in-chief and executive producer) and Derl McCrudden (AP’s vice president of news and head of global news production). "20 Days in Mariupol" is distributed domestically by PBS Distribution and internationally by Dogwoof.