Two separate incidents at Delhi and Mangalore airports involving suspicious power banks this week have prompted the aviation security regulator to write to NIA and Intelligence Bureau to carry out an investigation.

A suspicious power bank inside a cargo consignment today sent security agencies at Delhi airport into a tizzy. An x-ray examination of a mail bag of India Post meant to be flown to Dibrugarh as a cargo item on IndiGo alerted security officials this morning.

When the airport personnel opened the power bank they found “clay-like substance” inside it, according to a source.

However, after another test, it was found that it did not contain any explosive material.

The incident came just two days after a power bank in the checked-in baggage of a passenger travelling from Mangalore to Dubai on IndiGo was found having a “clay-like substance”.

While the gadget was found to be free of any explosive material, the Bureau of Civil Aviation Security (BCAS) asked the airline to file an FIR.