The Prime Minister, a practising Catholic, announced that flags at all Commonwealth Government buildings would fly at half mast on Tuesday in a mark of respect.
Chandra Arya warned that Khalistani extremists, empowered by political backing and funding, are silencing Hindu voices and intimidating moderate Sikh institutions in Canada.
Graham Staines and his sons, Philip (10) and Timothy (6), were burnt alive by a mob while sleeping in their vehicle outside a church in Manoharpur village on 22 January 1999.
The crash killed 42-year-old mother Nancy Lefrançois and her 11-year-old son Loïc Chevalier, who were travelling in a passenger vehicle struck in the collision.
