Police are investigating the death of a baby boy who suffered a cardiac arrest shortly after he was circumcised.
The boy began having breathing problems at Golders Green United Synagogue, in north London, on 1 February.
He was taken to a hospital nearby but was transferred to University College Hospital where he died on 9 February.
But a Board of Deputies of British Jews spokesman said there was "no causal connection" between the circumcision and the baby being taken ill.
The spokesman said: "The circumcision was carried out safely and in accordance with the usual scrupulous adherence to the strict rules governing the procedure and the mohel (circumciser).
"There is no indication that this was anything other than a tragic juxtaposition of two events," he said.
He said on average more than 2,000 circumcisions of baby boys are carried out under Jewish auspices in Britain every year.
Preliminary findings from a post-mortem examination said the baby died from cardiac arrest and oxygen starvation to the brain.
A Scotland Yard spokesperson said the death was being treated as unexplained.
The circumstances that led to the child becoming ill are being investigated.