Jonathan Alcorn/Reuters
Many held signs, chanted, "No justice, no peace," and called for federal civil rights charges against Zimmerman, who was cleared of all charges after fatally shooting Martin, an unarmed black teenager in Sanford, Florida.
The jury, which deliberated for 16 hours over two days, said that Zimmerman's use of deadly force was justified in self-defense. But thousands of Americans expressed that they didn't agree with the verdict, demonstrating afterward the intense emotions the case has continued to produce throughout the country.
The protests were mostly peaceful, but about a dozen people were arrested in New York for blocking traffic, according to NBC New York.