A source in his ruling conservative Popular Party, who refused to be named, said the 60-year-old conservative Spanish leader was walking through the city of Pontevedra on the latest stop of his push for re-election in Sunday polls when the incident happened.

The source said the teen approached and hit him, "knocking off and breaking his glasses," adding Rajoy was fine and had continued his walk through the city.

A video of the incident shows the youth, wearing a black jacket and sporting a crew cut, punching the prime minister hard on the left side of his face before being wrestled to the ground.

The incident comes at an eventful time for the electoral campaign, marked by a debate of rare ferocity on Monday, which saw the usually calm Rajoy slam his main rival Pedro Sanchez of the opposition Socialists as 'a miserable wretch' when he questioned his integrity.

Sanchez wanted to know why the premier had not resigned over corruption allegations that have swirled since he took office in 2011.

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