By STEFANIE DAZIO, ETHAN SWOPE, JAKE OFFENHARTZ and JOSEPH B. FREDERICK (Associated Press)

       LOS ANGELES — Dueling groups of protesters clashed Wednesday at the University of California, Los Angeles, grappling in fistfights and shoving, kicking and using sticks to beat one another. Hours earlier, police carrying riot shields burst into a building at Columbia University that pro-Palestinian protesters ...

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