“They were flown in a special flight,” they stated.
“The four are currently kept in Dibrugarh central jail,” a police officer stated, with out elaborating additional.
The Dibrugarh police is probably going to tackle the media later within the day.
According to police, Punjab authorities had on Saturday launched a serious crackdown in opposition to Singh, a radical Sikh preacher and Khalistan sympathiser, with the police arresting 78 members of the outfit headed by him.
(With inputs from PTI)