(CNN)Fires and violence broke out in the streets of Barcelona on Friday, as more than half a million pro-independence protesters gathered in the Catalan capital, the local police said.
Nine people, including four minors, have been arrested Friday, a spokesman for the Spanish Interior Ministry told CNN. The spokesperson said the clashes left three police officers injured.
The protesters have been out in force every night since Monday, when nine Catalan politicians were handed heavy sentences by the Spanish Supreme Court for their role in an independence movement that tried to separate Catalonia from the rest of Spain two years ago.
