ISLAMABAD: Pakistan's former prime minister Imran Khan said on Monday the country was moving toward a revolution, though it was yet to be seen if the political change would arrive through electoral process or bloodshed.

Khan, who was ousted from power in a parliamentary no-trust vote in April, is leading a protest march to Islamabad to seek fresh elections in the country by mounting political pressure on the government.

His caravan departed from Lahore's Liberty Chowk on Friday, and his anti-government "long march" has entered its fourth day.

"The sea of people along our March on the GT Road," Khan, who is also the chairman of the Pakistan Tehreek-e-Insaf (PTI) party, said in a Twitter post while sharing a picture and a video of people traveling with him. "For 6 months I have been witnessing a revolution taking over the country. Only question is will it be a soft one through the ballot box or a destructive one through bloodshed?"

Pakistan's interior minister Rana Sanaullah told a local news channel a day before the government had not decided yet if it would allow Khan's protest march to enter the federal capital.

The coalition administration has already expanded the boundaries of Islamabad's high-security Red Zone since the PTI began its protest.

"It has not yet been decided whether to allow them [the PTI protestors] entry into Islamabad," Sanaullah told Geo News during a talk show on Sunday. "They would be allowed to enter if they ensure a peaceful protest."

Prior to that, the interior minister told a news conference on Saturday the PTI chief wanted to bring armed men to Islamabad to trigger clashes between protestors and law enforcers while playing an audio clip as evidence that featured a purported conversation between his close aide, Ali Amin Gandapur, with an unidentified person.

Sanaullah has already said the government plans to take Gandapur's audio recording to court in which he allegedly asked the person on the other side of the phone about the number of guns and individuals in the context of the march.

The former prime minister on Sunday stopped the movement of his caravan after a female reporter was accidentally killed on its way to capital.

He is expected to resume the anti-government march later today.