By Noel Randewich BERKELEY, Calif. (Reuters) - A melee erupted on Saturday in a Berkeley, California park where supporters and opponents of President Donald Trump were holding competing rallies, resulting in at least 13 arrests as police struggled to keep the two camps separate. As fist fights broke out between the two sides and people threw bottles and cans over a barricade separating them, police resorted to using to an explosive device at one point in a bid to restore order. The trouble unfolded when hundreds of Trump opponents staged a counter-rally alongside an event billed as a "Patriots Day" free speech rally and picnic, organized by mostly Trump supporters.



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