Through which Article of the Constitution, the government declared an emergency in 1975?

Article 352

The response of the government was to declare a state of emergency. On 25 June 1975, the government declared that there was a threat of internal disturbances and therefore, it invoked Article 352 of the Constitution. Under the provision of this article the government could declare a state of emergency on grounds of external threat or a threat of internal disturbances.