Milpitas detectives were working Tuesday to get to the bottom of a blast of bullets at a nightclub near the Great Mall last weekend that left two friends dead and two brothers arrested. The killings were the city's first homicides since 2003. Dead are Trevor De Voe, 24, and Irwin Dillon, 20. The Santa Clara suspects, Nuuelva Sofara, 19, and his 16-year-old brother -- who has not yet been named because of his age -- are booked on homicide charges. The two may be members of a local subset of the violent Crips gang, according to prosecutor Dave Tomkins. ``This...