A Chechen exile shot dead in a Berlin Park had fought against Russian troops and may have been assassinated by a Russian agent, as reported by BBC.
German police arrested a 49-year-old Russian man soon after the shooting on Friday, and found the suspected pistol and bike used in the attack.
The victim was Zelimkhan Khangoshvili and he had long been a target.
Witnesses quoted in German media said the killer approached Khangoshvili, aged 40, from behind on a bicycle and shot him twice in the head, then sped off.
The attack took place in the Kleiner Tiergarten Park in Moabit, central Berlin, just before midday on 23 August.