The man is believed to have died as a result of stab wounds.
"Two people had been involved in a discussion on social media and then it escalated. What I can say is that it is not a coincidence that they met on the beach," prosecutor Sonja Seligmann told the newspaper.
Between ten and fifteen people were reportedly at the scene at the time of the incident.
What I can say is that it is not a coincidence that they met on the beach, says Seligmann.
Another person was taken to hospital after the incident. Four people have been arrested after the incident on suspicion of murder and attempted murder.
