The call for nationwide vigils designed to press for federal action in the emotionally charged case drew thousands to one New York rally.
Elsewhere turnouts were modest with the crowds drawn overwhelmingly from the black community, including in Miami where the slain 17-year-old's father spoke.

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"The death of my son, we believe, has to make changes in our society and repeal the laws that allow to kill somebody just because someone thinks (he) is suspect," Tracy Martin said.
The surprise appearance of hip hop star Jay Z and his wife, pop superstar Beyonce Knowles, helped swell the crowd at a Manhattan protest addressed by Trayvon's mother, Sybrina Fulton, and civil rights leader Al Sharpton. The protests came a day after President Barack Obama publicly identified with Martin and the deep frustrations felt among African-Americans over the verdict. "Trayvon Martin could have been me 35 years ago," Obama told reporters Friday.
The president's remarks - his most expansive since a Florida jury's decision one week ago to acquit neighborhood watch volunteer George Zimmerman - were applauded by many at Saturday's vigils.
Rallies in 100 cities across US to demand "Justice for Trayvon"