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Rallies for Trayvon Martin get underway in Washington DC and Florida

Win McNamee / Getty Images

Members of the National Black United Front hold a Trayvon Martin Solidarity Rally outside the U.S. Department of Justice on March 26, 2012 in Washington, DC. Trayvon Martin, a 17-year-old Florida high school student, was shot and killed, in Sanford, Florida on Feb. 26.

Haraz N. Ghanbari / AP

Ayesha Fleary joins a rally in front of a Department of Justice office, March 26, 2012, in Washington.

NBC News and msnbc.com staff report that Thousands of people streamed through the streets of Sanford, Fla., on Monday to demand that authorities prosecute the man who shot and killed 17-year-old Trayvon Martin one month ago.

The protesters were on their way to a special meeting of the City Commission at the town's Civic Center that began at 5 p.m. ET, where members were to hold a hearing on the killing of Martin, who was unarmed, by George Zimmerman, 28, a neighborhood watch volunteer.

Other rallies and vigils are planned for later tonight in Atlanta, Denver, Los Angeles, Philadelphia, Chicago and Des Moines.

Mario Tama / Getty Images

Trayvon Martin supporters hold hands while marching through downtown, March 26, 2012, before the start of a town hall meeting about Martin's death in Sanford, Florida. The teenager's family addressed the town hall meeting along with Rev. Al Sharpton. Martin was killed by George Michael Zimmerman while on neighborhood watch patrol in the city.

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Trayvon Martin's parents maintain he was trying to get away from George Zimmerman, despite claims that Zimmerman was acting in self-defense. Meanwhile, on Monday, thousands of people descended upon Sanford, Fla., demanding justice for the Florida teen who was shot while on his way home from a convenience store. NBC's Ron Allen reports.