One onlooker could be overheard shouting at the officer, 'don't squeeze him so hard' as he used the controversial George Floyd-style restraint while the youngster screamed in agony on the pavement, the Daily Mail reported.
Another female in the crowd gathered round the policeman branded him an 'abuser' as he used his hands to press down on the boy's face to keep him pinned to the floor.
A second policeman was then filmed asking for the ID of an older woman thought to be the boy's mum who started criticizing the police as they took the teenager away.
He turned round and demanded her name and address and ID documents after police reinforcements arrived and she repeatedly demanded to know why such force had been used against the youngster after he was spotted with his face covering down around his neck.
The incident happened on Tuesday in the northern city of Miranda de Ebro just below Spain's Basque region.
It occurred just days after six police officers in Madrid were filmed forcing a woman into a police car and hitting her head off the vehicle during an arrest for not wearing a mask.
Relatives of the youngster admitted he had been wearing his face mask round his neck when he was approached by police.
The restraint the policeman used in the latest drama was being compared today in Spain to the controversial restraint method that led to George Floyd's death in Minneapolis in May.