Security has been tightened at the country's three international airports in Dhaka, Chittagong and Sylhet apprehending 'subversive activities'.
In the capital, security has been beefed up at Hazrat Shahjalal International Airport apprehending 'subversive activities' by the authorities.
As part of the tight security measures, visitors are being prevented from entering the airport since Tuesday morning.
Sources at the airport said the authorities have taken the decision not to allow visitors inside the airport as the intelligence agencies have information that saboteurs carrying explosives might enter the airport in the guise of visitors.
The intelligence agencies also have the information that the saboteurs might carry out explosives that might be undetectable by metal detectors and archways, according to the officials. Assistant superintendent of Airport Armed Police (AAP) Tanjina Akhter said they have intensified the security for security rearrangement.
"Considering the overall situation and based on intelligence reports, security has been intensified since Sunday night and it will continue until further instructions," the airport's Director MK Zakir Hassan told reporters on Tuesday.
MK Zakir however, did not share any detail about the intelligence inputs or whether they contained any specific threat of attack.
However, a handout issued by the Civil Aviation and Tourism Ministry said the entry of visitors have been suspended due to refurbishment works.
Meanwhile, additional security measures have been taken at Shah Amanat International Airport and some major points of the port city.
Chittagong Metropolitan Police (CMP) have taken the security measures in and around the airport and in some major points, including railway station, bus terminals, port and court areas, of the city.
All police stations and police camps of the city have been asked to stay alert. Besides, additional police have been deployed in the city, said AKM Shahidur Rahman, CMJP additional commissioner (administration, finance and traffic).
In Sylhet, the authorities concerned of Osmani International Airport have tightened security in and around the airport for the same reason.
Chief security officer of the airport Nazrul Islam said they have been instructed by higher authorities for taking special security measures at the airport.
The airport alert comes in the backdrop of foreign countries maintaining security alert for their citizens residing in Bangladesh - raised after the first foreigner killing.