THESSALONIKI – A resurgence of violence outside a Thessaloniki high school where six teens were arrested for initiating an attack has led to a call by Education Minister Niki Kerameus for an investigation into right-wing extremists said to be involved.

Another fracas broke out despite the presence of police patrols near the technical high school in a neighborhood of Greece's second-larget city, with the Youth Party of the neo-Nazi Golden Dawn party claiming responsibility.

Police arrested six teens over the first battle that saw the extremists attacking students who were holding a demonstration of other students previously assaulted for handing out fliers with left-wing sympathies.

The victims were overwhelmed by dozens of black-clad hooded youths who had gathered inside the school grounds. The second attack was even more violent and saw Molotov Cocktails, rocks and glass bottles thrown, said Kathimerini.

The vicious attacks brought online praise from ultra-extremists who are popping up again after the former leaders of Golden Dawn and dozens of members were jailed after being convicted of running a criminal gang.

The tension led to the deployment of squads of police almost surrounding the school and barring access to anyone not a student or staff member or teacher, trying to keep out agitators.

Students and representatives of trade unions gathered near there as well to protest the attacks and were said to be joined by parents of students although it wasn't said if they were acting as protection for them.

Riot police used tear gas to repel groups of the far-right elements in the second attack that came just ahead of an anti-Fascist rally at Terpsithea Square, a few yards away from Stavroupoli vocational high school.

One schoolgirl, a member of the school’s student council, said that she was attacked by masked men and that they tore into the school, beat her and pulled her out. It wasn't said if the school has any security guards or protective measures.

It was also unclear, the paper said, if the attackers were students or outside elements linked to far-right groups who had been mostly out of sight after the Golden Dawn convictions but are coming back again.