An episode of a Stephen Lawrence documentary examining police corruption was mysteriously removed from iPlayer by the BBC.

Responding to questions from viewers, a BBC Twitter account said the programme had been taken down variously “for editing”, for “legal reasons”, and for “rights reasons”.

A spokesperson for the corporation told The Independent it was off air to "correct an inaccuracy", but refused to provide further details.

It comes despite the episode having already aired on terrestrial television last week. A revised version was added to the BBC’s streaming service late on Tuesday morning.

Stephen: The Murder that Changed a Nation has received critical acclaim for its analysis of the racist killing of 18-year-old aspiring architect Stephen Lawrence in 1993.

The three-part TV series takes a hard-hitting look at Stephen's death by a group of white youths at a bus stop in south-east London, the subsequent failures of police to properly investigate, and the 1998 public inquiry that found the Metropolitan Police to be “institutionally racist”.

Gary Dobson and David Norris found guilty of the murder of Stephen Lawrence Show all 2 1 /2 Gary Dobson and David Norris found guilty of the murder of Stephen Lawrence Gary Dobson and David Norris found guilty of the murder of Stephen Lawrence pg-8-lawrence-trial-afp-get.jpg Gary Dobson and David Norris were found guilty of murder AFP/Getty Images Gary Dobson and David Norris found guilty of the murder of Stephen Lawrence stephen-lawrencever2.jpg Murdered teenager Stephen Lawrence PA

According to the BBC’s website, the third episode of the series looks at “questions of racism and corruption” surrounding the police, and “revelations that the police spied on the Lawrence family”.

Some social media users reacted with anger at the removal of the show.

“Absolutely livid they’ve taken down the last episode due to legal reasons,” one user wrote. Another said: “So mad that the third episode of the Stephen Lawrence documentary got removed from BBC iPlayer.”

The series was timed to coincide with the 25th anniversary of the teenager's death on Sunday.

Ahead of a memorial service, attended by Stephen’s parents and the royal family, Theresa May announced a national commemoration to Stephen will be marked on 22 April each year, and will be known as Stephen Lawrence Day.