Calcutta airport authorities have ordered a probe to find out how a passenger nearly boarded an Air India flight to Aizwal on Saturday with two bullets in his cabin baggage.

“The CISF has been asked to submit a detailed report on why the bullets could not be traced during mandatory security checks,” said a senior airport official on Monday.

The bullets in Mizoram-resident Lalma Lalsama Zasai’s bag were found during an extra security check.

The CISF men said they did not scan the bag because it had gone though the X-ray for registered luggage and carried a security tag.

Zasai was carrying it as cabin baggage because his registered luggage had exceeded the 20-kg limit.

An Air India official said on Monday that Zasai’s bag might not have passed through an X-ray.