Every school in the district has been put on alert following a national recall of bracelets made from highly toxic seeds containing a poison that can kill in tiny doses.

A warning to alert staff to the dangers was issued by Davina Hartley, accident prevention co-ordinator for Bradford Safeguarding Children Board, following advice from West Yorkshire Fire and Rescue Service.

The red and black bracelets, sold at tourist attractions across the UK, are made from the Jequirity bean, a seed containing the toxin abrin, which can kill in doses of as little as three micrograms if swallowed.

People who have bought the bracelets are being urged to bag them and then wash their hands and avoid touching their eyes.

The bracelets have been supplied to 36 retailers, including London Zoo, Whipsnade Zoo and the Eden Project, in Cornwall, which is believed to have sold 2,800 of them over a year.

A spokesman for wholesaler Rainstick Trading, which supplied the bracelets, said none had been sold to retailers in Yorkshire.

One of the Eden Project’s own horticulturists spotted the poisonous seeds leading to them being withdrawn from sale.

A spokesman for the attraction said: “We are talking about a strung seed bracelet which comes from Peru. The seeds are laced into string.

“We've identified the seeds as potentially dangerous so we have withdrawn the bracelets from sale immediately.

“We have been advised that in an extreme case, if these seeds are chewed or ingested, it is very dangerous and potentially lethal.”

In the warning sent to schools, Mark Dixon, head of occupational health and safety at West Yorkshire Fire Service, said: “Information has come into the brigade relating to a bracelet which has been sold by a number of tourist attractions, which is made of highly toxic red and black beans.

“The Eden Project, in Cornwall, is one of 36 retailers urging customers to return the red and black bracelets made from the Jequirity bean, the deadly seed of the plant abrus precatorious.

“People who have bought the bracelets are being urged to bag them and then wash their hands and avoid touching their eyes.”