[originaltext]　　Forensic (法医的) experts in Colombia have begun a search for hund

　　Forensic (法医的) experts in Colombia have begun a search for hundreds of bodies at a landfill site believed to be one of the largest urban mass graves in the world. (3)Relatives of possible victims held a ceremony at the site on the outskirts of the city of Medellin before the digging work started. Natalia Kaushoi reports from Bogota. "The operation is expected to last five months. Around a hundred thousand cubic meters of rubble will be removed to try to find the bodies of people killed in a joint operation between the army and paramilitary groups that took place in 2002. (4) It is estimated that around 90 bodies were dumped in the landfill site at the time, but victim organizations suggest that could be up to 300."
　　3. Before the digging work started, what did the relatives of possible victims do?
　　4. How many bodies could be possibly found in the site according to victim organizations?