"Depending on the role of the public servants involved in the case, we may register a case", CBI sources said.
Customs officials had yesterday arrested four persons-the two SIs-- Manu and R Krishnakumar of the state Intelligence posted at the immigration department, carrier Ijaz (19), who arrived here on Wednesday night from Dubai and a travel agency owner Rasheed of Kalady.
The gold was hidden in a laptop bag.
On interrogation by customs officials, Ijaz said he was asked to place the bag at a particular point at the Immigration hall on arrival. He had undertaken a similar journey on Jan 7 from Dubai.
CCTV footage of Jan 7 purportedly showed SI Manu removing the bag from the spot.