>> reporter: there have been protests going on in a number of cities across the country. these have for the most part been peaceful. but because of these protests a number of police departments were placed on tactical alert. in los angeles, for example, people said that they were not surprised but disappointed. they said that they're no stranger to protest, comparisons have been made between the tensions in ferguson with those that led to the 1992 l.a. riots sparked after four lapd officers were acquitted in the beating of rodney king. and in oakland, a few hundred people lined the streets with banners and marched on the i-580 freeway. the california highway patrol is working to clear protesters from the freeway but no word on any arrests at this point. in seattle, demonstrators were joined by macklemore and also in chicago late monday, roughly 200 protesters marched on lake shore drive shutting it down following the announcement of the grand