Across the country, protesters rage at the acquittal of George Zimmerman.

Thousands of protesters gathered in cities across the United States to decry George Zimmerman's acquittal. Zimmerman shot unarmed teenager Trayvon Martin. The ruling was issued Saturday evening. 

U.S. President Barack Obama called for calm on Sunday. "We should ask ourselves, as individuals and as a society, how we can prevent future tragedies like this," the President said in a statement.

Demonstrations in Los Angeles and New York drew especially large crowds, with protesters marching down the 10 Freeway in L.A. and hundreds occupying the heart of Times Square in Manhattan.

Here's a glimpse at what some of the protests looked like:

ATLANTA

BALTIMORE

CHICAGO

DETROIT

LOS ANGELES

A demonstrator blocks a commuter train as they protest the acquittal of George Zimmerman in the Trayvon Martin trial, in Los Angeles, California.. (Jonathan Alcorn/Reuters)
A crowd of demonstrators block traffic on the Interstate 10 freeway while protesting the acquittal of George Zimmerman in the Trayvon Martin trial, in Los Angeles, California.

(Jonathan Alcorn/Reuters)

Demonstrators march during a protest against the acquittal of George Zimmerman in the Trayvon Martin trial, in Los Angeles, California.

(Jonathan Alcorn/Reuters)

A protester (2nd L) shouts as Los Angeles Police try to remove protesters from the intersection of Exposition and Crenshaw boulevards, following the George Zimmerman verdict in Los Angeles, California.

(Jonathan Alcorn/Reuters)

MIAMI

The crowd begins a short march for Trayvon Martin in Miami, Florida July 14, 2013. (Andrew Innerarity/Reuters)

MILWAUKEE

NEW YORK CITY

A boy holds up a sign in reaction to the acquittal of George Zimmerman in New York.  (Reuters/Eric Thayer)
A woman stands on a traffic signal during a march in reaction to the acquittal of George Zimmerman in New York. (Eric Thayer/Reuters)
Protesters rally in response to the acquittal of George Zimmerman in the Trayvon Martin trial in Times Square in New York. (Keith Bedford/Reuters)
Hundreds of activists demand justice for Trayvon Martin after marching to Times Square from New York's Union Square. (Adrees Latif/Rueters)
People take part in a march in reaction to the acquittal of George Zimmerman in New York .

(Eric Thayer/Reuters)

OAKLAND

PHILADELPHIA

SAN FRANCISCO

SANFORD, FLORIDA

People react to the verdict at Seminole County Court where George Zimmerman was found not guilty on second-degree murder and manslaughter charges in Sanford, Florida. (Steve NesiusReuters)
Demonstrators react to the verdict outside Seminole County Court where George Zimmerman was found not guilty on second-degree murder and manslaughter charges in Sanford, Florida. (Joe Skipper/Reuters)
Congregation members enter the Allen Chapel AME Church for services in Sanford, Florida. (Joe Skipper/Reuters)
Pastor Valarie J. Houston makes a statement about the not guilty verdict for George Zimmerman at the Allen Chapel AME Church in Sanford, Florida. (Steve Nesius/Rueters)

WASHINGTON, D.C.

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