Footage has emerged of the moment police attacked a father in front of his children after Benfica won a second consecutive league title in Portugal.
Benfica clinched their second successive Primeira Division title with a goalless draw at Guimaraes as their only challengers Porto were also held.
Benfica went into the penultimate round of games with a three-point lead - and that is where they stayed, meaning their superior head-to-head record against Porto guaranteed them the trophy.
There were some disturbances after the game but this footage shows police using heavy-handed tactics on a father in front of his kids. Their grandfather was also punched in the incident.
The father was struck on numerous occasions with batons as his distressed sons were restrained.
The Portuguese Interior Ministry has launched an inquiry into the incident.