Germany, with its history of Nazis using ancestry research to hunt down individuals with Jewish bloodlines, is extremely sensitive to the concept of genealogy research conducted by police.
A shipping container, referred to as 'treatment room' by the suspects, contained a dentist's chair together with surgery instruments, pliers and shears intended for torture.
Several officers were injured and cars suffered damages after police responded with tear gas to the stones and fireworks thrown at them by a group of minors on Midsummer night.
Prime Minister Boris Johnson suggested that much of the violence came from the right-wing counterprotesters, who were separated from the Black Lives Matter protesters by barriers and police lines.