Demonstrators and police have clashed in Sao Paulo during the first in a planned series of anti-World Cup protests called by radical activist group Anonymous across Brazil.

With less than five months before the June 12 kick-off – when the five-time champions and hosts take on Croatia – Brazil is facing the same kind of social rumblings that marred last year’s Confederations Cup dress rehearsal.

Anonymous called for Saturday’s protests against football’s fabled event via its Facebook page under the slogan, “The Cup will not take place.”

Other activists said “FIFA go home” on Twitter, referring to football’s world governing body, which was likely watching the weekend’s events with some concern.

Brazilians are avid users of social media, a favoured tool to organise protests.

But turnout was modest.

In the country’s sprawling industrial and financial hub of Sao Paulo, about 2000 people demonstrated near the Art Museum and on the key Avenida Paulista, chanting and waving signs like “Wake up Brazil, a teacher is worth more than (footballer) Neymar.”

Demonstrators and police clashed, with protesters burning tyres and garbage, and some engaging in vandalism targeting banks and other businesses.

Local media said anarchists had infiltrated the protests, and that 30 people were arrested.

Rio de Janeiro – where huge demonstrations turned violent in July – rallied just about 200 to a demonstration on landmark Copacabana Beach.

The capital Brasilia and the central city of Goiania each saw small demonstrations of fewer than 100, local media reported.

Anonymous, which has staged a number of highly publicised stunts in different countries, vowed that the protests planned for 36 cities across Brazil – a nation of 200 million – would “be followed by others.”

Many in football-mad Brazil say they are not against the World Cup as such – their country of 200 million is the most successful nation in the tournament’s 84-year history.

But they are outraged to see hundreds of millions of dollars spent on preparing 12 host cities for the sports jamboree when poor infrastructure and areas such as health and education require urgent massive investment.