"We have detained four persons and they are being questioned," Senior Superintendent of Police (SSP) of Rajouri district Suleman Chowdhary said today.
As precautionary measure, the authorities have imposed prohibitory orders under CrPC Section 144 in Kalakote town, he said.
Two persons were injured in Tuesday's clash.
The SSP said that a special investigation team (SIT) has been constituted to probe the case.
Meanwhile, NC workers resorted to protest demonstrations and blocked Kalakote road over the incident and demanded withdrawal of a case against its workers.