They say it has been shut down in the vast Somali region and neighbouring areas, including the city of Harar.

This is the first time internet access has been cut in Ethiopia since the state of emergency was lifted in June.

There have been days of deadly clashes in the Somali region during a power struggle between the regional and federal authorities.

The regional president, Abdi Mahamoud Omar, resigned on Monday.

He has since been arrested and taken to the capital, Addis Ababa.