France blocks Italian trains carrying migrants

Authorities in France have blocked trains from Italy in an attempt to stop north African migrants from entering the country.

Trains carrying migrants and political activists have been stopped at the border - prompting Italy to launch an official complaint with its neighbour.
Italy has angered France by giving out temporary resident permits to thousands of Tunisian migrants.
The permits allow them to travel freely in many European countries.
The Italian foreign ministry said the French move was "illegitimate and in clear violation of general European principles".