'Pupils were strangled with their scarves, beaten up, had blood all over their faces' said Janis, in her final year at Sophie-Germain secondary school in Paris. Students blockaded the building to protest against France's controversial immigration law, which prompted the police to intervene 'to unblock access to fire exits, at the request of the head of the school', police officials said. 'In 21 years of teaching here, I've never seen anything like this. (...) It's like using a tank to swat a fly,' said a teacher of the police methods used. IMAGES AND SOUNDBITES