"The man, a barber by profession, hailing from Sahranpur in Uttar Pradesh and presently residing in Chandigarh with his family was detained for questioning after his wife reported that he had brought a country-made gun from somewhere and was threatening to harm Advani for the past few days," a police official said.
Earlier in the day, Advani -- whose 'Jan Chetna Yatra' reached in Chandigarh on Wednesday evening -- addressed a press conference before he left the city for Uttarakhand and Himachal Pradesh.
The police said the security agencies of the neighbouring states where the yatra is to pass have been alerted.
Meanwhile, after Advani addressed a press conference here and left the venue, around 20 Shiromani Akali Dal (Amritsar) activists headed by former MP Simranjit Singh Mann and some Nihangs (members of a Sikh sect) raised pro-Khalistan slogans.
Advani's yatra had been greeted with black flags by protesters belonging to radical Sikh outfits and SAD at some places in Punjab.
