New Delhi, May 9 -- The Bureau of Civil Aviation Security (BCAS) issued a detailed advisory on Thursday mandating stricter security protocols at airports nationwide amid escalating tensions with Pakistan.

Following the advisory, airlines issued messages of their own and warned passengers to arrive at airports at least three hours before departure. Akasa Air, IndiGo and SpiceJet all issued advisories urging travellers to allow extra time for additional security checks. Check-in counters will close 75 minutes before flight time, added Air India.

The new security measures, effective until May 18, bar visitors from entering airport buildings and suspend the sale of visitor tickets. Additional passenger and baggage checks will be conducted a...