Pork DNA in halal sausages at Westminster primary school and other schools around the country.
Pork DNA has been found in halal chicken sausages served in a primary school in Westminster, central London, the local authority said.
The sausages were from St Mary's Bryanston Square, a Church of England school, Westminster Council confirmed.
Tests on a sample from Burdett Coutts School revealed the presence of lamb and pork DNA in lean minced beef.
The items have been removed from all school meals and the contractor was asked not to use its meat supplier.
Council officers took seven samples in total from three schools in the last week of February to carry out tests on meat products served in schools following the horsemeat scandal.
Under Islamic law, Muslims are strictly forbidden to eat pork.
Halal sausages are served in 15 primary schools, two nurseries, one special school and one pupil referral unit, which take only halal meat.
More than 4,400 pupils choose sausages as a meal option, the council said.
The council said it decided to carry out tests for the presence of DNA from beef, lamb, pork, chicken, turkey, goat and horse after the horsemeat scandal.
No horse DNA was found in the tests.
The Food Standards Agency (FSA) was alerted by the council on Monday.
Andrew Christie, Westminster City Council's director of children's services, said: "We are very concerned by the discovery that a contractor has fallen short of the high standards we demand.
"We also understand and regret the upset that may have been caused to parents and children alike.
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