New Delhi, Jan 04 (ANI): Reactions poured in on Sunday after the Air India office in Kolkata received hijack threat. BJP leader Sambit Patra said that Intelligence agencies and concerned agencies will see to it that no terror attack happens. BJP leader Subramanian Swamy also urged the government to increase safety measures on the airports. Security expert Qamar Agha termed the threat as 'very serious' and hoped that the government will take it seriously as Kolkata is on the target list of Pakistan backed extremists.