Santa Cruz autonomist supporters attack a bus of supporters of Bolivian President Evo Morales near San Julian some 160 km (99 miles) northeast of Santa Cruz May 4, 2008. Sporadic clashes broke out in Bolivia's richest region of Santa Cruz on Sunday as voting started in an autonomy referendum seen as a rejection of President Evo Morales' leftist reforms. REUTERS/David Mercado (BOLIVIA)
REUTERS/DAVID MERCADO