Stevie Wonder leads celebrities marking Martin Luther King Jr Day

Stevie Wonder led the celebrities marking Martin Luther King Jr Day as he decried the US’s ‘lack of progress’ on equality (Yui Mok/PA)

Stevie Wonder led the celebrities marking Martin Luther King Jr Day as he decried the US’s “lack of progress” on racial equality.

Revered civil rights leader King was assassinated in 1968 and his birthday was made an American national holiday in 1983.