The central agency claimed to have come across leads showing the involvement of a section of customs officers posted in the districts.
Unavailability of drivers to take cargo to Bangladesh and problems related to parking of trucks in Petrapole have led to the crisis.
The Indian nationals, mostly from the northeastern states, crossed the border through the three checkpoints on the borders with Meghalaya, Assam and Tripura.
Indian High Commissioner to Bangladesh, Riva Ganguly Das, had travelled up to the border and supervised the return of the Indians.
Official sources declared the battalion headquarters, its administrative base camp at Gandachara, and Karina border outpost as containment zones.
The stranded truckers, mostly from Punjab, Haryana, Madhya Pradesh, Maharashtra, Odisha and Nagaland, alleged that the transporters have left them in the lurch and are not picking up their calls.
Residents of Kathalchhari and Amtali villages along the border claimed the BGB personnel along with locals have tried to push the woman into the Indian territory from 3 different places since April 2.
As per an agreement between India and Myanmar, the locals on either side can move up to 16 km within each other’s territory without documents and stay there for a while.