The president opened up about the forms of racial discrimination he experienced as a young man and said: 'I could have been Trayvon Martin.'
Trayvon Martin's parents have been meeting with members of the black community here in the UK.
Doreen Lawrence and Sybrina Fulton met today to visit the memorial of murdered Stephen Lawrence and discuss justice for their sons
George Zimmerman has been charged with "assault and battery" following a disturbance at his girlfriend's home - Associated Press (AP) reports.
AP says his girlfriend reported him for pointing a shotgun at her.
Zimmerman, who was cleared of shooting black teenager Trayvon Martin, was arrested at his home in Florida today.
George Zimmerman, the Florida man who was acquitted of murder in the shooting of unarmed black teenager Trayvon Martin, was arrested after police responded to a disturbance call, police said.
It was not immediately clear what Zimmerman was accused of, but a statement by the Seminole County Sheriff's Office said he was being transported to a county jail in Sanford, Florida.
Seminole County Sheriff spokeswoman Kim Cannaday could not be immediately reached for comment.
A juror in the trial of George Zimmerman has said the jury "felt in their hearts" he was guilty but couldn't convict due to a "lack of evidence".
Earlier this month, Zimmerman was cleared of murder after killing unarmed black teenager Trayvon Martin in what he says was self defence, sparking protests across the US.
The woman, who was identified in court as juror B29, said she would have liked to convict Zimmerman but her hands were tied.
She told 'Good Morning America': "You can't put the man in jail even though in our hearts we felt he was guilty. But we had to grab our hearts and put it aside and look at the evidence."
Juror B29 added that Zimmerman had a lot to answer for: "[He] got away with murder, but you can't get away from God. And at the end of the day, he's going to have a lot of questions and answers he has to deal with. (But) the law couldn't prove it."
She said after the trial had ended, she wrestled with her decision and had a hard time sleeping and eating. She said she feels she owes Trayvon's parents an apology.
Hollywood star Jamie Foxx expressed his support for the family of black teenager Trayvon Martin, after George Zimmerman was acquitted over his death. Foxx addressed the issue at Comic-Con in San Diego.
According to the Washington Times, the actor met the teen's mother Sybrina Fulton at an awards show. He said: “She’s always been courageous in saying this has never been about race. She said it’s about 17-year-old kids. We have to protect our kids. So I stand with her forever.
“There’s something wrong when a 17-year-old child is on his way home and someone with a gun pursues him and he ends up losing his life".
Protests have been held in more than 100 US cities against the acquittal of George Zimmerman over the death of black teenager Trayvon Martin.
Around 2,000 protesters took to the streets of New York in honour of Trayvon Martin, led by the slain teenager's mother.
Sybrina Fulton told the crowd, "Trayvon was a child. I think sometimes it gets lost in the shuffle because as I sat in the courtroom, it made me think they were talking about another man. And it wasn't. It was a child."
She was joined at the event by Beyonce and her husband Jay Z, along with New York City mayoral candidate Christine Quinn and civil rights activist Reverend Al Sharpton.
Hundreds of people have taken to the street of Los Angeles to honour Trayvon Martin as rallies take place across the US following the acquittal of George Zimmerman, the man who killed the teenager.
Chants of "no justice, no peace!" broke out occasionally during the peaceful gathering outside a federal courthouse in Los Angeles.
"We've got to stop our children getting cut down at an early age," Pastor William Smart, President of the Southern Christian Leadership Conference, said.
Trayvon Martin's father Tracy told a crowd at a vigil in Miami that he would fight for justice for his son 'until the day I die'.
Trayvon Martin's mother Sybrina Fulton spoke at a rally in New York today in honour of her son, a week after the acquittal of George Zimmerman.
She told the crowd: "Trayvon may not have been perfect, but he was mine."
Around 200 people cheered as rapper Jay-Z and his wife, singer Beyonce, took the stage in New York where Trayvon Martin's mother, was expected to speak later.
Some hoisted signs at the rally that read "Boycott Florida" and many wore T-shirts with a photo image of Martin wearing a hooded sweatshirt.
"I've got four beautiful daughters. I want them to look forward rather than behind their backs," said Harlem resident Maria Lopez, 31, who attended the rally with her children.