Pakistan has suspended mobile and internet services “in areas with security concerns” as supporters of imprisoned former premier Imran Khan gear up for a protest in the capital.

Supporters of former Prime Minister Imran Khan are set to march in Islamabad, facing heavy security. The protest aims to challenge alleged electoral injustices and government policies.

Authorities in Islamabad have sealed off routes to the Red Zone – which houses the country's executive, judicial, and legislative authorities – and deployed Rangers at key government buildings.

The government has already sealed off capital Islamabad with shipping containers and shut down major roads and highways connecting the city with PTI strongholds

Police officers stand guard on an entry point to motorway leading to Islamabad, which has been closed by authorities due to a planned rally by supporters of imprisoned former Prime Minister Imran Khan's Pakistan Tehreek-e-Insaf party, in Lahore, Pakistan on Nov 23. (AP)