Every September, millions of tourists flock to Munich for Oktoberfest. However, the true centre of German beer culture lies three hours north in the medieval town of Bamberg.

Oktoberfest has tightened security around the beer festival in the wake of a deadly knife attack in western Germany last month.

MUNICH (AP) -- Security has tightened at Oktoberfest after a deadly knife attack last month in western Germany, and officials are warning revelers to expect longer lines to enter as metal detectors are deployed for the first time in the Bavarian beer festival's 189-year history.