Hundreds of people marched through the city, disrupting traffic and spray-painting graffiti. Authorities reported instances of vandalism and assault during a rally that organizers had billed as peaceful earlier in the day. In other parts of the country, spirited demonstrations on college campuses and peaceful marches along downtown streets have taken place since Wednesday. –– ADVERTISEMENT –– A mainly peaceful protest by about 3,000 people ended in Los Angeles early Saturday with about 200 arrests for failure to disperse after police broke up the lingering demonstration. Hundreds joined a Friday afternoon “love rally” in Washington Square Park in Manhattan.