Violent scenes after pre-dawn raids in the east of the capital Caracas.<br/> <br />Security forces break up four student camps.<br/> <br />Hundreds of demonstrators are forced onto the streets.<br/> <br />Student activists set up barricades, throwing stones and petrol bombs, while police respond with tear gas.<br/> <br />President Nicolas Maduro said a policeman was killed by a sniper and others were wounded.<br/> <br />(SOUNDBITE) (Spanish) PRESIDENT NICOLAS MADURO, SAYING:<br/> <br />"Three young members of the Bolivarian National Guard, 24-years-old each, were hit by three bullets. The young man who was killed by a protester, this murderer, sniper, shot Jorge Esteven Colina Tovar, 24-years-old, in the neck. We give our blessing to the Colina Tovar family."<br/> <br />The government said 243 people were arrested, accusing them of using the camps to stage violent attacks. Police said they found weapons and mortars.<br/> <br />(SOUNDBITE) (Spanish) SANDRA SEGURA, RESIDENT OF THE NEIGHBOURHOOD SAYING:<br/> <br />"I heard the neig
