Gurupawant Singh Pannun threatened grave danger to Air India on November 19.
Advising Sikhs to avoid flying, he declared a 'GLOBAL BLOCKADE.'
Delhi and Punjab airports tightened security, responding to the threat.
Canada investigates Pannun's warning, exacerbating existing India-Canada diplomatic tensions.
India condemns Pannun's threat, subtly criticizing Canada's handling of terrorists.
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