The state government is working on reviving and upgrading the 311 sirens installed on public and private premises in Mumbai to serve as early-warning systems. These civil defence sirens, many of which are dysfunctional, will be connected through the Internet for centralised operations to enable public authorities to communicate with people directly during emergencies. Sources said the central operation of the air-raid precaution system was shutdown in phases after 2004 due to technology obsolescence. Also, it is not possible to immediately find out if the sirens, particularly those installed on private properties are working. The Directorate of Civil Defence, the official said, had written to MTNL this month seeking net connectivity for the sirens to be controlled centrally.

Source: dna February 25, 2018 00:22 UTC