Kulvir Singh, a Khalistan Commando Force (Panjwar) militant extradited from the United States, was Tuesday sent to five-day police custody.
Kulvir Singh Barapind has been accused of murdering 52 people and injuring 13.
Situation in Jammu was "tense" on Friday as Sikh youth defied prohibitory orders and held protests in various areas as part of a three-day old agitation which is spreading and saw one more policeman being stabbed and his AK rifle taken away.