It, however, turned out to be a hoax.
"All I can tell you is that it's a hoax telephone call," a top police officer told PTI.
Police are investigating who made the call and from where it originated.
Following the call, police tightened vigil at the city- based corporate hospital and only patients and the employees of the hospital were allowed inside.
However, a thorough search of the premises proved the call to be hoax, police said.
The Apollo Hospitals had turned virtual fortress for 75 days since Jayalalithaa was admitted but the heavy police deployment was withdrawn after her body was taken to Poes garden residence on Monday.
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