Article Photos: Chicago police seeking tips in girl's slaying 2/3

Chicago Police Superintendent Garry McCarthy talks about the department's efforts to curb gun violence during a news conference Monday, Feb. 4, 2013, in Chicago. Police say they are receiving many tips as they investigate last week's shooting death of a 15-year-old Hadiya Pendleton. But there is also a concern that people with valuable information may not be coming forward and others wonder if people are staying silent out of concern that talking might put their own lives in danger. (AP Photo/Charles Rex Arbogast)