A win for civil liberties groups, but state attorney general says she will appeal ruling to supreme court if necessary

A panel of three federal appellate judges has ruled that a Louisiana law requiring the Ten Commandments to be posted in each of the state’s public school classrooms is unconstitutional.

The ruling on Friday marked a major win for civil liberties groups who say the mandate violates the separation of church and state – and that the poster-sized displays would isolate students, especially those who are not Christian.

The mandate has been touted by Republicans, including Donald Trump, and marks one of the latest pushes by conservatives to incorporate religion into classrooms. Backers of the law argue the Ten Commandments belong in classrooms because they are historical and part of the foundation of US law.

Heather L Weaver, a senior staff attorney with the American Civil Liberties Union, said Friday’s ruling “held Louisiana accountable to a core constitutional promise: public schools are not Sunday schools, and they must welcome all students, regardless of faith”.