Pakistani authorities have restricted access to Twitter, Facebook and other social media platforms amid mounting violence in the country generated by the arrest of Pakistan’s former Prime Minister Imran Khan.

“Additionally, total internet shutdowns have been observed in some regions,” NetBlocks, the global internet monitor, said on Tuesday.

Amnesty International said officials at Pakistan’s telecommunication authority told the UK-based rights group that regulators had blocked social media, and that internet service was suspended in Islamabad and other cities.

“This restricts people’s access to information and freedom of expression,” Amnesty International said. “We call upon the Pakistan Telecommunications Authority and Interior Ministry to immediately reverse this ban.”