Warning: Strong language can be heard in the following videos.
Police used their bikes to shield businesses and eventually began to use pepper spray and "flash bang' grenades _ releasing a flash of light, smoke and a loud noise _ to disperse the crowd. But that pushed the group to the Capitol Hill neighborhood, and they left a wake of overturned trash cans and debris on the street, as well as smashed windows on local businesses.
Read our complete May Day coverage:
After May Day, Seattle mayor laments we're a better city than this
Protesters, police clash in Seattle May Day confrontation
Photos: Violence vs. Peace during May Day 2013
May Day in Seattle wasn't all bad
Small businesses bear the brunt of angry protesters
Seattle superheroes turn out for May Day