Border Agent Kills Man Who Threw Rock at Him Agent was patrolling known smuggling trail near San Diego By Kate Seamons, Newser Staff Posted Feb 19, 2014 10:23 AM CST 145 comments Comments A US Border Patrol agent looks out over Tijuana, Mexico, behind, along the old border wall along the US - Mexico border, where it ends at the base of a hill in San Diego. (AP Photo/Gregory Bull, File) (Newser) – A US Border Patrol agent who claims he feared for his life after a rock hit his head reacted by shooting and killing the man who hurled the stone. It marks the ninth fatal shooting involving rock throwing since 2010. The unnamed agent was patrolling a smuggling trail east of San Diego early Tuesday when he came upon men suspected of crossing the border illegally; rocks were thrown at him, with one hitting his head. The San Diego Union-Tribune describes one of them as being as large as a basketball, and many of the rest fist-sized. The AP reports that the incident fuels an ongoing debate over whether lethal force is justified as a response to rock attacks. The Border Patrol has long maintained that rocks are deadly weapons, and has rejected proposals that would prevent it from responding to them with deadly force. Under current policy, agents can use deadly force if they have a reasonable belief that their lives or the lives of others are in danger. Agents were attacked with rocks 185 times in the 2012 fiscal year, making it the No. 2 type of assault, according to the Department of Homeland Security inspector general. They responded with gunfire 22 times and with less-than-lethal force—such as pepper spray and batons—42 times. The rock-thrower, a noncitizen, was pronounced dead at the scene; it's unclear how many times he was shot, but the agent fired at least twice. The agent has been placed on paid administrative leave, reports the Los Angeles Times.