Chilean presidential convoy and armored vehicles arrive at Los Alamos police station after an ambush in the morning killed three police officers in the worst violence in years. People gather in front of the police station to protest the attack. "It is a very strong pain as a mother because I am the mother of a 'carabinero,'" says the mother of a police officer who says to have lost a colleague in the attack. The bodies of the three officers were found in a burned-out armored patrol vehicle on a road near the city of Concepcion, some 500 kilometers (300 miles) south of capital Santiago. They appeared to have been shot. IMAGES AND SOUNDBITES