People march to call for justice and security after the tragic death of 9-year-old Uma Aguilera, the daughter of a police guard for Security Minister Patricia Bullrich, in Loma de Zamora, Buenos Aires. Uma died January 22 of a bullet to the head when her parents, both police officers, were trying to escape in their car from an attempted robbery and were attacked from another vehicle, according to official sources. IMAGES AND SOUNDBITES