Guatemalan flags are placed in musical instruments known as "Guiros", during a screening of the women's 20km race walk during the London 2012 Olympic Games, inside a park in the neighborhood of Zona 18, Guatemala City, August 11, 2012. Guatemalan race walkers Mirna Ortiz and Mayra Herrera, who competed at the London 2012 Olympic Games in the women's 20km race walk, were born in the neighborhood of Zona 18. REUTERS/Jorge Dan Lopez (GUATEMALA - Tags: SPORT ATHLETICS OLYMPICS)