On June 24, 2021, Champlain Towers South, a condominium in Surfside, Florida, collapsed in the middle of the night, killing 98 people. Sharyn Alfonsi reports on the investigations into what caused the disaster.

From Frontline PBS: “Putin’s Attack on Ukraine: Documenting War Crimes” draws on original footage; interviews with Ukrainian citizens and prosecutors, top government officials and international war crimes experts; and a vast amount of previously unpublished evidence obtained and verified by the AP — in