Supporters of opposition leader Leopoldo Lopez place flowers in front of the headquarters of a government ammunition factory (CAVIN) in CaracasBy Andrew Cawthorne and Daniel Wallis CARACAS (Reuters) – Security forces and protesters fought around Venezuela on Thursday in streets blocked by burning barricades and a supporter of socialist President Nicolas Maduro was shot dead, the sixth fatality from more than a week of violence. Maduro said a “fascist bullet” killed Alexis Martinez, a brother of a ruling Socialist Party legislator, in the central city of Barquisimeto. The protesters, mostly students, want Maduro to resign, and blame his government for violent crime, high inflation, shortages of goods and alleged repression of opponents. The most sustained clashes on Thursday were in the western Andean states of Tachira and Merida, which have been especially volatile since hardline opposition leaders called supporters onto the streets in early February.