A source from the Public Security Police (PSP) told Lusa that clashes occurred between the two teams' supporters before the start of the game, which forced the police to intervene.
"The PSP needed to intervene in the clashes and it was necessary to shoot into the air, as we were greeted with the throwing of stones, bottles and torches", they explained.
The authorities ended up detaining 54 people for “participating in a brawl”.
“Twelve ended up receiving medical assistance and were transported to the hospital, accompanied by the PSP”, he explained.
Benfica won the game 2-0 and now move into the next round of the competition.