The BBC showed "basic" journalistic failures in a news report in which it wrongly accused a senior politician of child abuse, an internal investigation has found.

The findings were announced on Monday after the BBC's acting director-general Tim Davie pledged to "get a grip" of the deepening crisis at the world's largest publicly-funded broadcaster as two more top news executives stood aside.

The investigation into the allegations that a former Conservative party treasurer, Alistair McAlpine, had abused children at a home in Wales in the 1970s found there had been a failure to complete "basic journalistic checks".