HEMPSTEAD - Hundreds of Long Islanders took part in a vigil in remembrance of Trayvon Martin today, one week after George Zimmerman was found not guilty in the teen's shooting death.

"Justice for Trayvon" vigils were held in 100 cities around the country today, with the Nassau chapter of Rev. Al Sharpton's National Action Network organizing an event in Hempstead. The vigil took place at the Nassau County District Court and started at noon.

The protesters are fighting for societal and legal changes, including an end to Florida's "stand your ground" laws. They are also pushing for civil rights charges to be filed against Zimmerman.

Barbara Powell, with the local chapter of the NAACP, says she believes that Martin was profiled, re-igniting debate over self-defense laws, guns and race relations nationwide.

Demonstrators say that until action is taken by the government, they will continue to speak against the alleged injustice and perceived problems with laws in the state of Florida.

One attendee said they are boycotting all companies and businesses that operate in Florida until the state changes its laws.

A large rally was also held today at NYPD headquarters, located at 1 Police Plaza in Manhattan. Rev. Sharpton and Martin's mother and brother attended that demonstration.

On Friday, President Barack Obama weighed in on the subject by saying that 35 years ago, he himself could have been gunned down.

Federal prosecutors are currently considering whether to file civil rights charges against Zimmerman.