The extraordinary claim from Charles Moore that Laura Kuenssberg has been "given personal protection" by the BBC following online threats from Corbyn supporters is now being widely reported (everywhere from the Sun to the Independent, the Mirror to the Telegraph, the Mail to the UK Press Gazette, the Evening Standard to Metro, RT to the Herald, etc,), and a further BBC source has now been quoted reinforcing the story:
Laura is a well-known public figure and as such the BBC has a duty of care. The very nature of covering politics means sometimes you go to events with big crowds and there can be hostility. When situations arise that are deemed a threat, precautions are taken.