AZ Border Agent Shot To Death; 4 In Custody NOGALES, Ariz. -- A U.S. Border Patrol agent was killed during an exchange of gunfire between agents and several armed individuals near the Arizona-Mexico border Tuesday night.FBI Special Agent Manuel J. Johnson said four individuals were in custody, including one who was taken to a hospital with a gunshot wound. He said authorities were still searching for a fifth suspect.Johnson said agent Brian A. Terry died shortly after he was shot about 11:15 p.m. in a remote and rugged area near Rio Rico, just north of Nogales.No names of those in custody were available, Johnson said."Our thoughts and prayers are with the Terry family for their tragic loss," said U.S. Customs and Border Protection Commissioner Alan Bersin."Our commitment to Agent Terry and his family is that we will do everything possible to bring to justice those responsible for this despicable act" Bersin said.The FBI is leading the investigation with cooperation of the Santa Cruz County Sheriff's Office, according to CBP."Today we are deeply saddened by the loss of Agent Brian Terry, a patrol officer from the Nogales Border Patrol Station," the Arizona Cattleman's Association said in a news release. "We are thankful for his dedicated service to protecting the United States of America."U.S. Sen. John McCain, R-Ariz., said, "This event is yet another reminder of the dangers the men and women of the Border Patrol face every day as they put their lives on the line to protect the American people."The increased violence in the border region demands that Congress provide the necessary resources and personnel to ensure the safety of all Americans, especially border patrol agents stationed on the border, and fulfill the Federal government's responsibility to secure our border," McCain said.