Besides Frankfurt - Germany's financial hub - there were incidents of violence in Berlin, Cologne and Hamburg cities as well

Rioters looted shops in central Frankfurt late on Saturday and clashes erupted with police there and in other German cities after largely peaceful mass protests over the cost of living.

Thousands earlier joined the demonstrations organised by the campaign group Gen Z regelt - meaning "Gen Z takes charge" - to protest against underfunding in schools, the high cost of living, public spending cuts and military service.

The unrest in Germany follows similar youth-led mass protests in France, where more than 320,000 people also demonstrated on Saturday.

A large section of Frankfurt's main shopping street was closed off by police, AFP news agency reported. A police spokesperson said many arrests were made in the city.

Authorities in Frankfurt, Munich and Berlin reported as many as 18,000 protesters, roughly half of what the organisers had estimated on their website.

Gen Z regelt spokesperson Lina Friedrich said the demonstrations were "to fight for peace and freedom, rather than for war and coercion".

She said: "What matters most to us is better support for the health and education systems. We are against compulsory military service and we are in favour of a fairer distribution of the burden."

Thousands demonstrate in Paris as protests spread across Europe

While protests during the day were largely peaceful, the demonstrations turned violent as night fell.

In a post on X, Frankfurt police said that "violent riots" were occurring in the city centre. The windows of several shops had been smashed and molotov cocktails were thrown at emergency services, police said.

In later updates, officials said the windows of a gun shop were smashed and that they had seized two weapons after arresting a suspect.

Roman Poseck, interior minister of Hesse state, of which Frankfurt is the biggest city, said that "around 100 clearly identified left-wing extremists" had infiltrated the protest in the city. He added that it was "shameful" how the protests had ended.

Poseck said: "We all have those images from France in our minds – looting, burning houses, burning police vehicles, and attacks on police officers... France must not be held up as a model in this regard."