No one was injured in the incident which took place in Pitampura late last night.
Enquiry was ordered to ascertain the reasons of collapse of the old school building structure adjacent to a multi-level car parking site, the NDMC said.
North Delhi Mayor Mira Aggarwal and Commissioner P K Gupta visited the site where the incident took place.
"They have ordered an enquiry to ascertain the reasons of the incident. Ravi Dass, Engineer In-Chief of South Delhi Municipal Corporation, has been entrusted the work of enquiry. He would submit the interim report in three days and complete the report in ten days", the NDMC said.
It is learnt that due to leakage, water accumulated under the earth which got softened resulting in its shifting and dismantled the structure erected to support the earth and construction of the concrete walls at the site, it said.
The softening and shifting resulted in collapse of the part of the old MCD school building, it said.
"Teams have been deputed to control the situation any further loss, seven pumps installed for de-watering of the area, concrete waste and debris dumping started, besides earth to fill-up the area", the NDMC said.
"Heavy machinery, including
