Looters wreak havoc at San Francisco's Union Square, Powell Street

Rioters Black and White Stock Photos & Images - Alamy

Looters wreak havoc at San Francisco's Union Square, Powell Street

San Francisco police report 80 arrests, looting and trash fires

Looters wreak havoc at San Francisco's Union Square, Powell Street

Taraval Station

Looters wreak havoc at San Francisco's Union Square, Powell Street

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Looters wreak havoc at San Francisco's Union Square, Powell Street

San Francisco mayor's plan to combat flash mob looting will limit

Looters wreak havoc at San Francisco's Union Square, Powell Street

Looters wreak havoc at San Francisco's Union Square, Powell Street

Looters wreak havoc at San Francisco's Union Square, Powell Street

Looters wreak havoc at San Francisco's Union Square, Powell Street

Looters wreak havoc at San Francisco's Union Square, Powell Street

Unacceptable': SF Mayor, Police Chief Respond After Looting

Looters wreak havoc at San Francisco's Union Square, Powell Street

Photos Day 2: Bay Area protests peaceful during day, dangerous at

Looters wreak havoc at San Francisco's Union Square, Powell Street

Looters wreak havoc at San Francisco's Union Square, Powell Street

Looters wreak havoc at San Francisco's Union Square, Powell Street

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Looters wreak havoc at San Francisco's Union Square, Powell Street

Looters wreak havoc at San Francisco's Union Square, Powell Street

Looters wreak havoc at San Francisco's Union Square, Powell Street

Maps: SF, Oakland businesses hit hard by vandalism, looting during

Looters wreak havoc at San Francisco's Union Square, Powell Street

Looters wreak havoc at San Francisco's Union Square, Powell Street