Uganda, Feb. 10 -- A jury has held the mother of a 15-year-old mass shooter criminally responsible for the deaths of four high school students. The verdict could have far-reaching implications.

Almost every day, Steve and Ai St Juliana wear the same sweatshirt, each adorned with a flower in the top left corner.

The matching outfits have brought a speck of colour to a life that the two said has become "duller" since the death of their empathetic and athletic 14-year-old daughter Hana, which means flower in Japanese. The five petals of the flower represent the family members, with Hana's name in the centre written in Japanese.

Hana was the youngest of four students killed at Oxford High School in 2021 when 15-year-old Ethan Crumbley open...