SANFORD — Vowing never to relent, the Rev. Jesse Jackson, other civil-rights leaders and the parents of slain teen Trayvon Martin demanded that city commissioners do their part to ensure shooter George Zimmerman is arrested.

"The whole world is watching Sanford," Jackson said. "The whole world is watching Florida today."

A line of speakers, including U.S. Rep. Corrine Brown, D-Jacksonville, and U.S. Rep. Sheila Jackson Lee, D-Texas, echoed Jackson's message. The Rev. Al Sharpton delivered a petition he said had 2 million signatures on it demanding Zimmerman's arrest.

Sharpton told Sanford leaders that the city is poised to be saddled with a reputation for trampling the civil rights of black people if it did not take action.

"You are risking going down as the Birmingham and Selma of the 21st century," Sharpton said at the Sanford Civic Center, which was packed with nearly 500 people.

Marc Morial, president of the National Urban League, called not just for Zimmerman's arrest, but for the repeal of Florida's "stand your ground" law and for the city to clean up its Police Department.

The commission took no action Monday night. Instead, Mayor Jeff Triplett said it would meet again in two weeks to entertain more public comment.

"We are in the pursuit of truth and justice," Triplett told the crowd.

Zimmerman, Neighborhood Watch coordinator at the Retreat at Twin Lakes town-house community, told police he acted in self-defense Feb. 26 when he killed the Miami Gardens 17-year-old. Florida law allows people to use deadly force if they think they are being threatened with serious harm or death.

Trayvon, who was visiting family, was walking back from 7-Eleven wearing a hoodie when he encountered Zimmerman, who called police to report him as a suspicious person.

Zimmerman told Sanford officers that Trayvon punched him, knocked him to the ground and banged his head on the pavement as Zimmerman cried out for help. Trayvon's family says 911 tapes show the boy was the one yelling for help.

Zimmerman has not been arrested, provoking nationwide protests, the appointment of a special prosecutor and even a comment from President Barack Obama. The U.S. Department of Justice and the FBI also are investigating.

Like the other speakers, Trayvon's parents asked commissioners to make things right.

"We're not asking for an eye for an eye. We're asking for justice, justice, justice," his father, Tracy Martin, said, pointing his finger for emphasis.

Trayvon's mother, more soft-spoken, said her heart is broken.

"I know I cannot bring my baby back," Sybrina Fulton said. "But I'm sure going to make changes so that this doesn't happen to another family."

An overflow crowd cheered and waved "Justice for Trayvon" signs at Fort Mellon Park on the Sanford lakefront as the parents' images appeared on two large screens.

During a rally at the park after the meeting, Martin family attorney Natalie Jackson praised the crowd for remaining nonviolent. On Saturday, the New Black Panther Party offered a $10,000 reward for Zimmerman's "capture."

"If you are not here to be in peace, you are not welcome," Jackson said.