A senior official at the Education Department said Ryan International school has been asked to file reply to the showcause notice within three days and a probe has already been initiated against it.
The action against the school, which has campuses in Vasant Kunj, Rohini and Mayur Vihar, came following direction by Deputy Chief Minister Manish Sisodia who also holds the Education portfolio.
The schools allegedly asked its staff including teachers and students to take membership of BJP.
Srinivasan, however, added that the schools had only supported government's Swachh Bharat Abhiyan.
When asked about the government's action, the school authorities at Rohini and Vasant Kunj campuses refused to comment.
Education department officials said focus of its probe was on whether the school authorities had asked staff including the teachers, and students to take BJP membership.
As per Ryan International School website, the group has a total of 106 educational institutions in 15 states. The Group had started its first school in Mumbai in 1976.
