The grotto of Mother Mary installed on a roadside in Kurla was desecrated at around 4 AM, police said.
The incident led to tension in the area and police were trying to pacify the angry locals.
They were also trying to obtain CCTV footage of the area. In one of the footages that they have managed to get, three persons were purportedly seen moving on a bike near the site, police said.
Efforts were on to nab the culprits, they said.
Reacting to the incident, social activist Nicholas Almeida said this kind of disturbance happens every now and then during election time.
He demanded strict action against the culprits.
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