GILROY, Calif. (Reuters) - Police continued on Tuesday to look into what motivated a teenager to shoot visitors attending a popular California food festival over the weekend, killing three people, including a 6-year-old boy and 13-year-old girl.Santino William Legan, 19, cut through a fence at the Gilroy Garlic Festival on Sunday and shot people, seemingly at random, with an assault-style rifle, according to the Gilroy police department. Police officers on the scene fatally shot the gunman within about a minute of him opening fire. Police had obtained search warrants for a home in Gilroy associated with the suspect and a...