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 said.
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.