Agents visit Conn. gun shops after school killings

A personal note from a child is placed on a memorial for the victims of the Sandy Hook Elementary School shooting, Sunday, Dec. 16, 2012, in Newtown, Conn. A gunman walked into the school Friday and opened fire, killing 26 people, including 20 children. (AP Photo/Mary Altaffer) Photo by STF
A personal note from a child is placed on a memorial for the victims of the Sandy Hook Elementary School shooting, Sunday, Dec. 16, 2012, in Newtown, Conn. A gunman walked into the school Friday and opened fire, killing 26 people, including 20 children. (AP Photo/Mary Altaffer) Photo by STF
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