Six drunken British men on a stag weekend faced heavy fines for misdemeanor on a Ryanair flight from London to Bratislava. The pilot had to make an unscheduled landing in Berlin to remove the men, which included the soon-to-be groom from the flight.

The men, aged between 25 to 28 years, were from Southampton and were travelling in a group of 12. The other six men have been allowed to stay on the flight, according to the German police. However, the men cannot be identified under the German law.

“All six male suspects are from the city of Southampton,” the Guardian quoted a police spokesperson a saying. “All persons were allowed to leave our police station after we finished the police measures.”

The German police said in a statement that, the men behave rowdily, threatened the safety and refused to obey the instructions of the crew. Reportedly, the men became aggressive when they were received more alcohol.

“This flight from London Luton to Bratislava diverted to Berlin after a number of passengers became disruptive in flight. The aircraft landed normally and police removed and detained these individuals at Berlin Schönefeld airport,” the Guardian quoted a Ryanair spokesperson as saying. “We will not tolerate unruly or disruptive behaviour at any time and the safety and comfort of our customers, crew and aircraft is our number one priority. This is now a matter for local police.”

The Sun newspaper published a video that showed one of the men swearing at another and threatening him, before blowing a punch.

Reza Heravi, a fellow passenger and eyewitness said that it was clear from the men’s behaviour that they were heavily drunk when boarded the flight and were singing very loudly.

“As we took off, they were hardly seated, they kept standing up and shouting random stuff,” the BBC quoted him as saying. “At one point one of the guys pulled down his trousers and exposed himself to the air hostess.”