The internet has been shut down in Ethiopia, amid growing protests against the government.
No official reason has been given for the closure.
The government has previously accused opposition activists in the diaspora of using Facebook and Twitter to organise protests in the country.
The internet was also blocked during anti-government demonstrations in August.
At least 55 people died in a stampede at a religious festival in the volatile Oromia region on Sunday after people starting demanding political freedoms.
Opposition groups accused security forces of opening fire, causing the stampede.
Prime Minister Hailemariam Desalegn denied the allegation, saying rioters had caused “pre-planned mayhem” that led people to fall to their deaths in ravines.