A boy holds a sign in front of a blocked tunnel during a protest to press for clarifications on missing persons including a bricklayer who recently disappeared, in Rio de Janeiro, Brazil, Thursday, Aug. 1, 2013. The 42-year-old father of six was picked up for police questioning on suspicions of involvement in drug trafficking, but was released shortly thereafter. He has not been seen from since. Official statistics showing that nearly 35,000 people were reported as missing in Rio state alone over the past five years.