Police described the fight in Esslingen, near Stuttgart, on Friday night as an attack by a biker-type gang of around 20 people. A 22-year-old man was killed after being stabbed several times, while his 21-year-old brother was seriously hurt and on Wednesday was still in hospital. Four others were seriously injured and five more slightly hurt.
A 23-year-old from the Esslingen area was arrested on Sunday while his 20-year-old brother reported to the police on the same evening after consulting a lawyer.
Two more men aged 21 and 23 were arrested on Monday. These four were on Wednesday being held in investigative custody and are expected to be charged with conspiracy to commit murder. Three other men were also arrested.