20 Days in Mariupol: parents' guide

Graphic, real aftermath of shelling: wounded and dying civilians, a teenage boy whose legs were blown off, a toddler and a 4-year-old given CPR, a fatally injured pregnant woman from the maternity hospital, and bodies wrapped and laid in a mass grave.

Frequent strong language in the subtitled dialogue, as residents, soldiers and doctors curse in fear and anger: many f-words and 'motherf-' variants, plus 'bastard,' 'bitch' and 'asshole.'

No sexual content or nudity. The film is focused entirely on the siege and its human toll.

Paramedics smoke during a brief lull and a soldier says he will have a cigarette first. No drinking or drug use is shown.

Sustained and harrowing: constant explosions, families sheltering in basements, parents grieving over children who have just died, a doctor haunted by what he has seen, and the crew's tense escape through occupied territory. Knowing it is real makes it far more disturbing than fiction.