Thousands of protesters are expected to reach Islamabad October 31.
Friday prayers at the area's main mosque symbolise the return to normality after security forces drove out militants.
The main purpose of the force is to ensure that police are visible in urban areas and can quickly respond to any emergencies.
Officials in Afghanistan have confirmed that Asim Umar, the head of al-Qaeda in the Indian Subcontinent (AQIS), was killed in an operation on September 23.
The assassinations of the Taliban supreme leader's brother and other top Taliban leaders have been linked to the money supply chain of the group's illicit drug trade.
'It is clear for us that Iran bears responsibility for this attack. There is no other explanation,' the leaders of France, Germany and Britain said.
Discontent and divisions among the Afghan Taliban leaders are growing, and combined with the group's increasing unpopularity among Afghans, the group is steadily weakening.
Following a crackdown on various factions of the TTP across the country, the militants have shifted their hideouts to provinces in neighbouring Afghanistan.
A TTP commander sent a number of officials and local leaders threatening letters demanding loyalty to the group. The government is hunting down the perpetrators.
Mehsud, in a book titled Inqilab-e-Mehsud released in December 2017, detailed the TTP's extortion, kidnappings for ransom and assassinations.