The agent with the Bureau of Alcohol, Tobacco, Firearms and Explosives was wounded just blocks from where two Chicago police officers were shot by a high-powered rifle while riding in a covert van almost exactly a year ago. One officer was hit in the arm and hip, the other in the back. Last July, another Chicago police officer was shot in the leg while chasing robbers at 46th Street and Ashland Avenue, not far from the other attacks.