So far, at least 21 people have been reported killed and hundreds have been wounded since the violence between security forces and anti-government demonstrators first erupted.
The attack comes days after millions of Afghans went to the polls to vote for their next president.
Pandal organisers, residents of apartments and colony associations have been directed to install CCTVs to monitor and prevent illegal activities during the festival.
Irfan Malik, a correspondent with the Greater Kashmir newspaper, was detained from his home in Tral in Pulwama district.
Sources in the ministry also said 100 companies (10,000 personnel) of central forces had been ordered for deployment about a week ago and they which are in the process of reaching their destinations.
No reason was given for the sudden deployment of over 280 companies late in the evening.
The identity and group affiliation of the slain ultra were being ascertained.
The alert was issued after the intelligence agency confirmed about the infiltration of some terrorists in the region from the across the border.
An Afghan official says at least 13 civilians, including women and children, have been killed after their house was hit by mortars during a battle with Taliban in northern Faryab province.
Security forces launched a search operation in Satoora forest area of Tral, on information about the presence of some militants there, a police official said.
A curfew will be imposed in seven police station areas of the city tomorrow as a pre-emptive measure to prevent spread of violent protests which took place today.
Due to the clashes, the traffic movement on Maulana Azad Road was halted, causing traffic jams in the city centre.