(add the country code for the US helpline number... Country code for the US from India is +1 or 001)
Up-to-date information on security can also be obtained by calling 1-888-407-4747 toll free in the United States and Canada or, for callers outside the United States and Canada, a regular toll line at 1-202-501-4444.
Here is the full travel advisory, located on mumbai.usconsulate.gov.
Consulate General of the United States of America
American Citizens Services
Unit78, Bhulabhai Desai Road
Mumbai 400 026, India
Telephone: 91 22 2363 3611 Facsimile: 91 22 2367 7026
Thanks Christine for sharing this information with me via eMail