The call received at the IIMB reception at noon sent he staff into a tizzy and in no time the building was evacuated, as there was skeletal staff and very few students since it is vacation time, police said.
A thorough search by the bomb disposal squad and the sniffer dogs revealed that it was a prank call, they said.
The call has been traced to a coin phone booth in a condiments shop in J P Nagar police station limits. However, the caller is yet to be traced, police said.