The Pakistanicapital Islamabad was put under a security lockdown on Sunday as supporters of jailed former Prime Minister Imran Khan demonstrated for his release.

Axar.az reports that, citing DW, the protesters are demanding Khan's release, as well as other members of the Pakistan Tehreek-e-Insaf (PTI) party, and the resignation of the current government, due to what they say was a rigged election.

The country suspended mobile and internet service in "areas with security concerns" in response to the protests. Highways leading to Islamabad were blocked where PTI supporters were expected to approach the city.

Gatherings of any sort have been banned under legal provisions, local police said in a statement.

Ali Amin Gandapur, chief minister of Khyber Pakhtunkhwa province and a key Khan aid, called on people to gather near the entrance to the city's red zone, known as "D Chowk."

"Khan has called on us to remain there till all our demands are met," he said in a video.