WARNING: GRAPHIC CONTENT - How investigators are tracking Russian war crimes in Ukraine

In Borodianka, a Ukrainian town in the Bucha district, northwest of Kyiv, 81-year-old Taisia Herasymenko says her son was shot dead by Russian soldiers. She is seeking justice and hopes a trial will come soon. The case is one of many that Ukrainian and international officials are investigating in the Bucha area where mass graves were discovered. Reuters follows investigators as they try to put the pieces together and look for any evidence of executions and torture.