A wave of biker gangs from the US, Canada and Australia arriving in Europe has raised fears of deadly turf battle like the Nordic biker wars of the 1990s, European police agency Europol warned on Friday. Gangs such as the Comancheros and Rebels from Australia, Rock Machine from Canada and the Mongols and Vagos from the US were moving into Europe. ... The gangs were seeking out particularly a dangerous hard core of recruits in their bid to seize territory to traffic drugs, weapons and people... The gangs "have a propensity to use extreme forms of violence", including with Kalashnikov...