New Delhi (CNN) Indian Prime Minister Narendra Modi has extended the country's nationwide lockdown until May 3 in a bid to contain the continued spread of the coronavirus, but said that some states which have avoided outbreaks may be allowed to resume "important activities."

Speaking in a televised address on Tuesday, Modi said it was vital that the virus is prevented from impacting parts of the country that remain unaffected.

"My request to all my countrymen is that coronavirus will not be allowed to spread across new areas at any cost," said Modi, who wore a scarf covering his mouth and nose which he removed before speaking. "We have to be very careful about hotspots. We will have to keep a close watch on the places that are expected to become hotspots."

The 21-day lockdown for India's 1.3 billion people came into force at the end of the day on March 24 and was set to expire on Tuesday, April 14.

Since the lockdown was enforced, only essential services have been operational. Those include water, electricity, health services, fire services, grocery stores and municipal services.

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