The Malad police are on the lookout for an unidentified man who vandalised the glass cover of the century-old grotto of Mother Mary opposite Our Lady of Lourdes Church, Orlem, early on Thursday morning.

An FIR has been registered under Section 95A of the Indian Penal Code (deliberate and malicious acts, intended to outrage religious feelings of any class) against the unknown miscreant, who had thrown a stone and broken the glass.