three teenagers arrest wednesday accuse three separate assault demonstration turn violent outside rally presidential candidate donald trump last week san jose california police say three unidentified juveniles males accuse take part number skirmish trump supporters anti-trump demonstrators last thursday outside san jose convention center trump hold rally lead-up tuesday california primary republican party presidential nomination two teenagers age 16 17 face charge felony assault deadly weapon third also 16 face misdemeanor battery charge san jose police department say statement one teenagers accuse use blunt object strike victim behind victim suffer visible injuries accord police four others arrest protest last week two 19-year-olds 18-year-old face charge felony assault deadly weapon another 19-year-old face misdemeanor charge refusal disperse unclear whether seven charge trump supporters among hundreds protesters see news clip wave mexican flag chant anti-trump slogans burn trump hat least one u.s. flag protesters many angry trump comment illegal immigration gather rally months trump republican party presumptive nominee nov. presidential election cancel rally chicago march clash break supporters protesters three teenagers arrest assault california trump protest