Supporters of ousted leader Hugo Chavez run towards Miraflores presidential palace, in this Saturday, April 13, 2002, photo. It's unknown exactly who fired into a massive opposition march April 11, killing at least 16 that day and wounding dozens, if not hundreds. Authorities say some of the shooters belonged to pro-Chavez neighborhood groups known as ``Bolivarian Circles,'' and the violence has brought new criticism of what Chavez's foes call Cuban-style snoops and enforcers. (AP Photo/Ricardo Mazalan)