Ember Inns, which owns the Railway Hotel in Hornchurch in Essex, has said its food was prepared to the highest hygiene standards.
A spokesman told the London Evening Standard:
The local authority is investigating an alleged food poisoning outbreak at the Railway.
We are fully co-operating.
Until the investigation is complete we can’t speculate about a possible cause or source.
More top news
We're on the cusp of of some deep rooted cold air from Siberia.
It has been 15 years since the end of the DRC's civil war, but now the country appears to be slipping back towards the abyss.
The former Save the Children chief executive has announced he is resigning from Unicef "because of the danger of damaging" both charities.