DALLAS (AP) - Four police officers were shot Thursday as they tried to serve a federal drug warrant on a home in southwest Dallas. One officer was in serious condition with a gunshot wound to the head, Dallas Police Lt. Rick Watson said. The others were in fair condition at Parkland Memorial Hospital. The officers had approached the home in an armored personnel carrier, Watson said. When they announced the raid over a loudspeaker, someone inside the home started shooting, he said. Four officers were hit, and Watson said the armored vehicle moved between them and the gunfire so they...