New details are emerging about what happened when the captain of an Iranian airliner called in a bomb threat on Monday en route to the southern Chinese city of Guangzhou. In the end, it turned out to be a false alarm as there was neither a bomb nor hijacking, but at the time of the captain’s call (which took place in Indian airspace,) the Indian Air Force (IAF) didn’t know that.

The IAF’s head, Air Chief Marshal VR Chaudhari, briefed the media on Tuesday on the sequence of events that led the air force to scramble a pair of Sukhoi 30-MKI fighter jets from a base in Punjab to shadow the plane while it transited through Indian airspace. He said all protocols were properly followed and commended the communication among the IAF and civilian air traffic controls in both Lahore and Guangzhou.