You can get this information from the insurance company representative about the coverage of act of terrorism because  many insurance company have a separate terrorism insurance as well as travel insurance. A blend of both insurance is now provided by many companies. Here is a list of some  insurance companies who provide travel insurance, You can confirm with them that they also provide/cover the terrorism insurance with it or not.

ICICI Lombard--Travel Plan

United India Insurance Co.-- Suhaha Safar Policy

Bajaj Allianz-- Shub yatra