According to Article 352 of the Indian Constitution, a national emergency can be imposed when there is a grave threat to the security of India or any of its territory due to war, external aggression or armed rebellion
भारतीय राज्यघटनेच्या कलम 352 अन्वये युद्धजन्य स्थिती, देशांतर्गत अस्थिरता, परकीय आक्रमण इत्यादीवेळी राष्ट्रीय आणीबाणी घोषित केली जाते.