Police officers are pinning a bare-chested man to the ground. One officer exerts pressure on the man’s legs, while another places his knee upon the man’s neck. A third officer attempts to handcuff him. Undeterred by the man’s cries of agony, the first officer keeps his knee on the man’s neck, grinding his face into the pavement. After five minutes, the man falls silent. The officer removes his knee but places his hands on the man’s torso. He now appears unconscious.

This is the final frame of a video filmed by a witness on their mobile.1 It made the death of Stanislav Tomáš in Teplice, Czech Republic, into worldwide news. Shortly after, Tomáš was taken to an ambulance where he was pronounced dead.