Police are investigating the cause of the fire in a chemical laboratory at India's main nuclear research facility that killed at least two people.
A spokesman for the lab near Mumbai says the fire was extinguished quickly and that no nuclear reactor, radioactivity or radiation was involved.
The facility has a number of nuclear reactors and the research involves both nuclear weapons and nuclear power.
The fire occurred on a day Japan's new prime minister offered to consider selling nuclear power technology to India. The offer comes despite differences over signing a test ban treaty.
Tokyo has refused to allow Japanese nuclear companies to do business with India until New Delhi agrees to stop conducting nuclear tests.
Copyright 2015 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.