The news agency said it had seen a document, sent to telecom service providers, mobile and Internet industry organisations by the Indian department of telecommunications in July, asking them to "explore various possible options" to block such applications.
Several deaths have occurred in India this year due to rumours which have been spread through WhatsApp.
Reacting to this, the Indian Government has asked Facebook to introduce "traceability and accountability", to ensure that provocative messages sent on WhatsApp can be traced to their source, or face legal action.
WhatsApp has more than 200 million users in India, its biggest userbase of any country. Indians are said to forward messages more often than people in other countries.
WhatsApp has already said it would roll out software changes to make it harder for messages to be forwarded.
An official at the telecommunications department told Reuters that the letter was meant to ask for ways of blocking apps during "emergency situations".
“There is a need for a reasonable good solution to protect national security,” he said.