Iran has restricted access to social media networks Instagram and WhatsApp amid protests over the death of Kurdish woman Jina Amini in police custody, said residents and internet watchdog NetBlocks.

Significant internet outages were also reported across the country, with one of the biggest mobile phone operators disrupted, leaving millions of Iranians offline.

Last week’s death of 22-year-old Jina Amini, who was arrested by morality police in Tehran for “unsuitable attire”, has unleashed a wave of anger over issues including freedom in the Islamic Republic and an economy reeling from sanctions.

At least six protesters have now been killed, according to Iranian media and officials, as well as a police officer and a member of a pro-government militia. However, activist groups say the death toll is higher.

NetBlocks also reported a “nation-scale loss of connectivity” on Iran’s main mobile telephone provider and another company’s network.