Three police officers were shot in Washington, D.C., while trying to serve an arrest warrant at a home Wednesday morning, and the suspect is still barricaded and opening fire, according to D.C. police.The incident began when officers with the criminal apprehension unit responded to a home in the 5000 block of Hanna Place SE, in the southeast part of the city, to serve an arrest warrant at about 7:30 a.m. ET, the chief said. An individual inside the home refused to come outside, and when officers tried to enter the home, the person fired at them, Smith said.The suspect remains barricaded inside the home and has continued to fire from the location, Smith said.