Will Smith refused a request to leave the Oscars ceremony after he slapped presenter Chris Rock, Hollywood's film academy said on Wednesday as it started a process that could lead to the best actor winner's expulsion from the group.

During the live telecast, Smith (above) strode up to the stage after Rock made a joke about the appearance of Smith's wife, then smacked the comedian's face. The actor returned to his seat and twice yelled an obscenity at Rock.

Less than an hour later...