The assassination of conservative commentator Charlie Kirk shocked America and exposed the depth of its political divides. Since a suspect has been arrested, the search for clear motive has only become more complicated.

In today’s episode, the BBC’s Social Media investigations correspondent Marianna Spring examines the meaning of the inscriptions on the bullet casings associated with the murder. The markings take us into the dark corners of the internet, but what do they tell us about why Charlie Kirk was killed?

Producers: Cat Farnsworth, Aron Keller and Lucy Pawle

Image: Utah Governor Spencer Cox. Cheney Orr/Reuters