Lancashire County Council has suspended the supply of all frozen processed beef products to schools after tests found horse DNA in halal burgers.
It's the second case of horse DNA found in some of the county's school meals this month.
Traces of horsemeat have been found in halal food destined for schools in Lancashire.
Tests found horse DNA in halal burgers supplied to four schools, all the schools affected have been informed.
Lancashire County Council has suspended the supply of all frozen processed beef products to schools, as a precaution, after its own scientific tests carried out on the products revealed traces of horsemeat in Halal burgers.
Earlier this month traces of equine DNA was found in cottage pie delivered to 47 schools in the county. The Halal beef burgers were available at four schools in the county.
All affected schools have been contacted and informed.
Lancashire County Councillor Susie Charles, cabinet member for children and schools, has said they had sought extras assurance that its external suppliers were not providing any products containing horse DNA.
Testing had returned one positive result, she said.
Traces of horsemeat have been found in food supplied to schools in Lancashire.
Cottage pies delivered to 47 schools has tested positive for horse DNA.
The product has now been withdrawn from kitchens and headteachers have been alerted.
Analysts at one of only six laboratories in the country doing the FSA's tests discovered the contaminated product late yesterday.
Granada Reports correspondent Matt O'Donoghue exclusively broke the story.
Cottage pie that was delivered to 47 schools in Lancashire has tested positive for horse DNA.
The product has now been withdrawn from kitchens.
Officials at Lancashire County Council say the amount of horse consumed by the children will have been 'minute.'
Analysts at one of six laboratories in the country doing the FSA's tests discovered the contaminated product late yesterday.
Scientists uncovered equine DNA at 0.1% concentration in samples.
Headteachers have been alerted.
Aintree racecourse say they are as confident as they possible can be that no unfit meat ever reaches the food chain.