India, Feb. 18 -- The slab of a fifth-floor apartment in Thane's Wagle Estate collapsed onto the flat below in the early hours on Tuesday, injuring three people, one of whom is critical.

The building was earlier classified by the Thane Municipal Corporation (TMC) as a C2B structure, indicating it required major structural repairs, but was not immediately dangerous. After the slab collapse incident around 3am on Tuesday, officials surveyed the building and determined that it poses significant risk. Accordingly, all residents were shifted elsewhere and the building may be pulled down after further assessment, officials said.

The incident occurred at Nutan Neelam Apartment, a 30/35-year-old five-storeyed building in the Shanti Nagar locali...