By STEFANIE DAZIO, ETHAN SWOPE, JAKE OFFENHARTZ and JOSEPH B. FREDERICK (Associated Press) LOS ANGELES (AP) — Dueling groups of protesters clashed overnight at the University of California, Los Angeles, shoving, kicking and beating each other with sticks after pro-Israel demonstrators tried to pull down barricades surrounding a pro-Palestinian encampment. Hours earlier, police burst into a building occupied by anti-war protesters at Columbia University, breaking up a demonstration that had paralyzed the school. After a couple of hours of scuffles between pro-Palestinian and pro-Israeli demonstrators at UCLA, police wearing helmets and face shields slowly separated the groups and quelled the violence.