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As protesters line the streets of Ferguson, Mo., they raise their arms and chant "hands up, don't shoot."

The sign for surrender has become a symbol of protest in the four days since police shot and killed 18-year-old Michael Brown.

Witnesses say the teen died Saturday after throwing his hands up and surrendering to police. Police have not confirmed that he put his hands up and have said there was a scuffle.

The Rev. Al Sharpton referred to "hands up" when he spoke to crowds Tuesday.

"When their hands are up, you don't shoot," Sharpton said. "If you're angry, throw your arms up. If you want justice, throw your arms up."

Protesters have also taken their cause to social media, tweeting with the hashtags #handsupdontshoot, #handsup and #JusticeForMikeBrown.

Twitter | @zellieimani

zellie on Twitter: "This is reality. #HandsUpDontShoot http://t.co/g9lIQUIwOX"

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Images of protesters with their hands up have been some of the most indelible of the ordeal in Ferguson:

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