On Wednesday, the FBI, the Bronx District Attorney's office and the NYPD Internal Affairs Bureau were looking for evidence at Diallo's Soundview apartment. The grand jury investigation into the police officers and the shooting could take at least three weeks to collect evidence from as many as two dozen witnesses.

There is still no decision on whether the grand jury will hear from the officers themselves.

Meanwhile, the Reverend Al Sharpton has returend to New York from West Africa. He was greeted by dozens of followers at Newark Airport, where he again expressed outrage over the Diallo shooting and described the pain the family is going through.

Sharpton says he's especially curious about why why the officers involved haven't been charged. He says, "We are absolutely offended that this young man was laid to rest while the police officers are yet to be arrested, are yet to be suspended. You do not need an indictment to make an arrest. You do not need an indictment to make a suspension."

Sharpton also says he will not be satisfied unless all four officers are convicted and spend the rest of their life in jail.

Sharpton flew to Guinea, West Africa last Sunday with Amadou Diallo's family. During the nine-hour trip from the airport to his childhood home in the village of Lebay, mourners lined the roads to watch as the pine box carrying Diallo's body passed by.

Amadou Diallo was buried Wednesday next to his grandfather. 1,500 mourners attended his funeral.