Heard that a fire had broken out at Bharti Office at Mindspace, Malad (not confirmed, may be a rumor). Maybe that's the cause.EDIT: Confirmed about fire. Got an update from Bharti guys (as our company uses Bharti link for data). Till now the employees are not allowed in. Therefore the outage may continue indefinitely.
The email from them clearly states about a fire incident at 4th Dimension, Mind Space, 4th floor Link Road, Mumbai, Maharashtra. It also states that the power has been switched off to the entire building, and no one is allowed in, so everything is down since early morning 2.04am. Therefore they are unable to share any ETR.