(BBC) Police in southern Italy say they are arresting dozens of suspected members of rival Mafia gangs linked to the killing of six Italian men in Germany.
Authorities are investigating family vendetta killings which have been going on for at least a decade mainly in and around the small town of San Luca.
Two brothers of two of the men killed outside a pizza parlour on 15 August are among 40 people wanted by police.
The Calabrian Mafia - the 'Ndrangheta - is notorious for vendettas.
The murders in Duisburg took place after a birthday party celebration.
The 'Ndrangheta is believed by police to control cocaine trafficking in many parts of Europe.
Membership of the 'Ndrangheta - which means "Honoured Society" - is believed to number in the tens of thousands.
The clan feud in San Luca, a town of about 4,500 at the southern tip of Italy, dates back to an egg-throwing incident in 1991. A fight broke out which left two young men dead and another two injured.