\"I just want justice for my son. I really do. I need justice for my son,\" Michael Brown, Sr., said today. \"I understand everybody has their own pains because they have losses too, but I need everyone to come together and do this the right way so we can get something done about this. No violence, man.\"

Sharpton emphasized the family's plea for non-violent protests.

\"To become violent in Michael Brown’s name is to betray the gentle giant he was,\" Sharpton said. \"I know you're angry. I know this is outrageous. When I saw that photo, the outrage rose up in me. But we cannot be more outraged than his mom and dad, and if they can hold their heads with dignity, then we can too.\"

\"PHOTO:
Jeff Roberson/AP Photo
PHOTO: A makeshift memorial sits in the middle of the street where 18-year-old Michael Brown was shot and killed by police, Aug. 11, 2014, in Ferguson, Mo.
>

The town of Ferguson, a St. Louis suburb, was filled with tear gas as police in riot gear fired rubber bullets Monday night to disperse protesters, renewing tensions after Brown's shooting death on Saturday.

\"We believe in the rule of the law but it's got to work both ways,\" Crump said at a press conference this afternoon.

Sharpton, Crump and others said they would only trust a full federal investigation into the shooting. The FBI is reviewing the case, looking into possible civil rights violations, while the St. Louis County police department is the lead investigating agency.

Ferguson Police Chief Jackson offered additional details today about the violent encounter that led to Brown's death.

\"What I can tell you is it started out as a routine encounter with two young men walking on the street. They were asked to get on the sidewalk,\" Jackson said. \"It quickly became a violent encounter and then became a fight, some kind of fight inside the car. Shots were fired. I don't know how many.\"

Jackson said that the officer has been placed on administrative leave and his gun will be kept by investigators as evidence, though he is not prevented from having another weapon.

The officer will have to undergo two psychological evaluations as part of his administrative leave.

\"He feels terrible about whole thing. He did not come to work with intention of this happening. He came to work to serve the community. He's sad and he is hurt. He's doing okay. It's a difficult thing,\" the chief said.

\"PHOTO:
Jeff Roberson/AP Photo
PHOTO: People raise their hands in the middle of the street as police wearing riot gear move toward their position trying to get them to disperse, Aug. 11, 2014, in Ferguson, Mo.
>

Brown and a friend were walking to his grandmother’s house, when the friend says an unidentified officer asked them to get off the street. Police say one of the men fought the officer.

Brown’s mother, Lesley McSpadden, says her son didn’t fight anyone.

“Just because he’s 6-foot (tall), black walking down the city street doesn’t mean he fit the profile,” McSpadden said.

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