Two more members of a Bradford family were rushed to hospital this morning - the latest victims of a deadly food bug outbreak.

Three others were already among thirteen people from Bradford and Calderdale who have been treated for the effects of e-coli 0157.

One child remained critically ill today with suspected kidney failure and three other youngsters were still in hospital.

Officials from Calderdale and Kirklees Health Authority were today investigating the source of the outbreak but are believed to be focusing on one dairy food outlet.

The bug has struck 13 people from seven families in Bradford and Calderdale, but health officials refused to give out any more information about the outbreak or those affected.

Health chiefs became aware there was an outbreak on Friday, but no public warning was issued by health chiefs until over the weekend.

Councillor Michael Taylor, Calderdale Council's cabinet member for health and social care, criticised the authority for not informing the public as soon as it became aware of the outbreak on Friday.

But Dr Howard Barnes, consultant on communicable diseases for the authority, said no warning was issued because it was felt the situation was under control.

He said: "Patients from all age groups have suffered from symptoms ranging from mild sickness and diarrhoea to the extreme of haemolytic uraemic syndrome, or kidney failure.

"Eight have been admitted to hospital and one child remains seriously ill.

"The possible source of the infection is currently under investigation and it appears likely that all cases relate to exposure to the infection prior to June 9. We are not expecting any more cases."The patients were taken to the St James's Hospital, Leeds, and Airedale Hospital at Steeton, for treatment.

Surgeries and hospitals in the area have been alerted to the outbreak so any more cases can be identified quickly.

Calderdale councillors were first alerted to the outbreak on Friday after test results on possible sources of the outbreak were returned to environmental health officers.

Coun Taylor said: "It did concern me that once it had been decided there was an outbreak more publicity was not given to the case, this would have been done if the council had been the lead authority. I don't personally think secrecy is ever a good idea."

His concern was echoed by Christine McCafferty, MP for Calder Valley, who said: "These things always come out anyway."

A spokesman for the Food Standards Agency said he was surprised more information had not been made public earlier.

Peter Ramsdale, assistant chief environmental health officer for the council, said more cases could surface if the bug spread within families.

Anyone with bloody diarrhoea is advised to seek medical attention and experts have said the risk of infection is minimised through normal personal and toilet hygiene.