Four New York City police officers were acquitted today of all charges in the death of Amadou Diallo, the immigrant from Guinea who was fired on 41 times as he stood, unarmed, in the vestibule of his apartment building in the Bronx.

        The verdict came in a tense and racially charged case that led to anti-police demonstrations, arrests and a reorganization of the department's Street Crime Unit, to which the officers belonged.

        But litigation over the shooting might not be over. After the verdict, Mary Jo White, the United States attorney in Manhattan, announced that her office, which has been monitoring the case from the start, and the Civil Rights Division of the Justice Department would review the shooting to determine whether any civil rights laws were violated. And Mr. Diallo's parents plan to file a civil lawsuit against the city. The officers could also face administrative charges within the department.

        The shooting occurred about 12:40 a.m. on Feb. 4, 1999, when the four officers, all in street clothes, approached Mr. Diallo on the stoop of his building and fired 41 shots, striking him 19 times, as he retreated inside. The officers, who are white, said they thought he had a gun. The only thing he had was a wallet.

        The jurors -- four blacks, including the forewoman, and eight whites -- deliberated for three days before reaching their verdict.

        The officers -- Sean Carroll, 37, Edward McMellon, 27, Kenneth Boss, 28, and Richard Murphy, 27 -- were as grim-faced today when the verdicts were read as they were when the trial began four weeks ago. They hung their heads, wiped their eyes and hugged each other and their lawyers. As they left the courthouse without speaking to reporters, they walked silently past a crowd of jeering protesters.

        Mr. Diallo's parents, friends and supporters sat quietly through the litany of not guilty verdicts and quickly left the courtroom. His mother's face was streaked with tears.

        The jurors told Justice Joseph C. Teresi, who presided over the trial, that they did not want to speak to reporters, and they were escorted out of the courthouse.

        During the trial, the officers acknowledged their mistake in shooting Mr. Diallo. The defense lawyers made the officers' testimony the centerpiece of their defense, asserting that the shooting was justified because they believed Diallo was grabbing a gun. Officer Carroll sobbed as he described how he realized his error and held Diallo's hand as he lay dying.

        Their lawyers laid much of the blame for the shooting on Diallo, saying he behaved suspiciously and had not obeyed the officers' commands to stop.

        The chief prosecutor, Eric Warner of the Bronx district attorney's office, argued that the officers, particularly Officer Carroll, had caused the fatal confrontation by prejudging Diallo as a possible rapist or robber, without considering he might have had a right to be on the stoop.

        Robert Johnson, the Bronx district attorney, said outside the courthouse, ''I'm satisfied that the jurors were fair here.'' But he added, ''This case raises a lot of issues about police tactics.'' People in the Bronx have been ''trying to get the attention of the Police Department for some time,'' he said, ''and this case will do it.''

        But others were sharply critical. Former Mayor David N. Dinkins said that he was outraged by the verdict. ''This will send the wrong message to those members of the Street Crime Unit who walk around saying, 'We own the night."

        The Rev. Al Sharpton, who led protests against the Police Department, said he would push the Justice Department to bring a federal civil rights case. ''This is not the end; this is just the beginning,'' he said. ''We took a detour to Albany and the detour is over.''

        Mr. Sharpton also asked for calm, saying, ''Those who believe in Amadou should not betray his memory by acting like those who killed him.''

        Outside the courthouse, Kadiatou Diallo, Amadou's mother, said, ''I ask for your calm and prayers.'' She added, ''As we go on for the quest of justice, life, equality -- I thank you all.''

        Mamadou Diallo, taking his son Abdul, 3, to day care, passes a mural near their Bronx home that is dedicated to the memory of their cousin Amadou Diallo.

        The mural is a memorial of police brutality. When police departments are allowed to think they can get away with murder, they will gun down those who do not comply immediately to their commands.

        People of every color are in danger throughout America because of this present police mindset, not in every officer; but in every police department.

        The officers put on quite a show of sorrow in behalf of the deceased, but a man does not pull out a wallet like he does a gun. They never for a moment supposed he had a gun. They were punishing him for not complying to their will.