An anonymous telephone call, on Thursday, claiming that a bomb was planted in the premises of the Apollo Hospitals and it would explode anytime sent authorities into a tizzy.
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. 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.
Former Tamil Nadu chief minister Jayalalithaa was undergoing treatment at the hospital since September 22 before her death on Monday while veteran journalist Cho Ramaswamy breathed his last at the hospital yesterday.
The Apollo Hospitals had turned into a virtual fortress for 75 days since Jayalalithaa was admitted, but the heavy police deployment was withdrawn after her body was taken to Poes garden residence on Monday
