The Darjeeling Municipalty has filed an FIR against the builders of an under-construction shopping complex which was coming up below the staircase, Chairman Amar Singh Rai said tpday.
Police said noone was injured in the incident that happened around 6.15 pm.
Local people alleged contractors had been digging up underneath the staircase for the complex and that led to the subsidence.
Rai further added, "The municipality engineers are preparing a technical report and we have filed an FIR against the builders at the Sadar Police Station.