Article 141 A of the Constitution describes the circumstances ubder which emergency can be proclaimed.If the President is satisfied that a grave emergency exists in which the security or economic life of Bangladesh or any part there of is threatened by-

1.War

2.External Aggression 

3.Internal Disturbance 

He may issue a Proclamation of Emergency 

Article 141(B)

According to Article 141(B) some fundamental rights can be suspended during the time of Emergency. 

Article 36-Freedom of movement 

Article 37- Freedom of Assembly 

Article 38- Freedom of Association 

Article 39- Freedom of thought 

Article 40- Freedom of Profession 

Article 42- Right to Property

If a law is made contrary to these six rights they shall be deemed to be suspended during the continuance of an Emergency.