Trayvon Martin parents call for shooter's arrest

(CBS/AP) SANFORD, Fla. - The parents of an unarmed black teenager who was shot to death by a neighborhood watch volunteer say they are not satisfied that the Sanford police chief is temporarily stepping down.

Trayvon's parents, Tracy Martin and Sybrina Fulton, told hundreds of supporters at a rally Thursday that they want George Zimmerman arrested in the shooting death of their son, Trayvon Martin.

"We want an arrest, we want a conviction for the murder of our son," said his father, Tracy Martin.

Civil rights leader Rev. Al Sharpton, who stood alongside Martin's parents said, "We don't need temporary relief, we need permanent change."

The parents made their remarks just hours after Sanford Police Chief Bill Lee said he would temporarily step aside to let passions cool.

Lee said Thursday he had become a "distraction" in the case and that he would "temporarily remove himself" from his position. Sanford's city manager said that he would seek an interim police chief.

Lee said he stands by his agency's decision not to arrest Zimmerman, who claims the Feb. 26 shooting was self-defense.

Civil rights groups have been holding rallies, saying the shooting was not justified. The 17-year-old black teen was killed inside a gated Florida community on his way back from the convenience store.

Neighborhood watch volunteer George Zimmerman has maintained he shot Martin in self-defense, which is permitted under Florida law if the shooter believes his life is in danger.

Martin's parents met with Robert O'Neill, the U.S. Attorney for the Middle District of Florida, and Roy L. Austin Jr., who is deputy assistant attorney general of the department's Civil Rights Division.

The State Attorney's Office is reviewing the case, which will be presented to a grand jury next month.

However, the Justice Department earlier this week agreed to open a federal civil rights probe into the Feb. 26 shooting.