"O' zapt is" – it's tapped! With two hammer blows, the Mayor of Munich tapped the first keg of beer Saturday morning following Oktoberfest tradition and the world's most famous beer festival officially opened.

Tens of thousands of people waited for the admission an hour before the opening, and according to a DW report, several tents have already closed their door to beer lovers and visitors due to overcrowding.

Many people ran for a spot in a tent so they can sit and enjoy the world's largest beer feast.

"I took the first commuter train early this morning," Felix Stenglein from nearby Eichenau told German news agency DPA.

Many revelers are dressing in traditional Bavarian clothes. Women are wearing a dress named dirndl, and men are all in lederhosen.

Around six million beer lovers from around the world are expected at the festival in Munich before the Oktoberfest ends on October 6.

Some 600 police officers and hundreds of security guards are tasked with keeping order around the many, often intoxicated visitors. Around 50 doctors are on call for those with health problems, and there's a special security area where women can find protection from harassment, DPA reported.

The first Oktoberfest was held in October of 1810, and although the current Oktoberfest does not necessarily take place in October, it still carries the name until today.

The visitor numbers are expected to be higher this year. According to DW, attendance in 2018 increased by 14 percent compared to the previous year, with 6.3 million people attending the festival.

The beer at the festival is not cheap; one liter costs about 13 U.S. dollars, a 30-cent increase over last year.

(With input from AP)