A teacher who took his class on a school trip to a historic cathedral was detained for giving unlicenced tours.

The group, from Budapest in Hungary, were in St Michael's Cathedral, in the Slovakian capital Bratislava, when they were all arrested.

Slovakian police said the teacher had broken the law by not having a licence to give guided tours and that the pupils had broken the law by listening.

They were freed hours later after officials from the Hungarian Embassy intervened.