According to the National Maritime Authority (AMN), the authorities were aware of the presence of about 30 people of foreign nationality who were taking part in festivities on the beach at Costa da Caparica, Setúbal district, after a complaint was received at 19:30.

The Maritime Police of the Costa da Caparica Post gave instructions for the people to disperse.

"[The indications] were accepted, with the person responsible for the party having been identified and the respective news report prepared", it can also be read.

A mixing console and two speakers that were being used at the party were also apprehended.