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Bengaluru, May 20: A mysterious "boom" heard in large parts of Bengaluru this afternoon left residents of the city and social media users puzzled. While the source of the sound is being investigated, the Indian Air Force (IAF) indicated that it could be the result of "routine test flights that necessitate going supersonic a times".

The sound was heard from as far as the Bengaluru airport in Devanahalli to the IT hub of Electronic City 54 km away. It was also heard in Kalyan Nagar in east Bengaluru, central Bengaluru's MG Road and areas such as Marathahalli, Whitefield, Sarjapur and Hebbagodi.

IAF said no aircraft of training command was flying in the area. "However, ASTE (Aircraft and Systems Testing Establishment) and HAL (Hindustan Aeronautics Limited) could have been undertaking their routine test flying, which necessitates going supersonic at times. These are done well beyond the city limits in specified sectors. However, considering the atmospheric conditions and reduced noise levels in the city during these times, the aircraft sound may become clearly audible even if it happened way out from the city," said the air force statement.

Many people had speculated that the sound could have been caused by a fighter jet such as a Mirage 2000.

"We have also asked the Air Force Control Room to check if it was a jet or supersonic sound. Bengaluru police are awaiting confirmation from the Air Force," Bengaluru police commissioner Bhaskar Rao said in a statement.

It was not an earthquake, Karnataka's state disaster monitoring centre had tweeted earlier.

"Earthquake activity will not be restricted to one area and will be widespread. We have checked our sensors and there is no earthquake activity recorded today," the Karnataka State Natural Disaster Monitoring Centre said, quoting its director Srinivas Reddy.

"The activity reported in Bengaluru is not due to an earthquake. The seismometers did not capture any ground vibration as generally happens during a mild Tremor. The activity is purely a loud unknown noise," the agency tweeted.

#Bangalore and #BangaloreBoom was among the top trends on Twitter this afternoon.

"We are trying to ascertain the source of the noise," a senior police officer said. "In Whitefield area, we have searched on the ground and so far, there is no damage to any property," he added. There were no calls to the police control room reporting any damage.

Bengaluru, Jun 3: The Karnataka Institute of Medical Sciences at Hubballi has successfully treated a COVID-19 patient through plasma therapy, state medical education minister K Sudhakar said today.

"Karnataka achieves yet another milestone in battle against #COVID19. KIMS Hubli has successfully treated a Covid19 patient through Plasma Therapy & is the first institute in the state to accomplish this. Congrats to KIMS doctors & staff for this feat!" Mr Sudhakar tweeted.

In plasma therapy treatment, plasma cells from a COVID-19 patient, who has recovered from the disease, is transfused to a coronavirus patient who is in critical condition to treat him.

Plasma therapy was effectively used in the past during Ebola and the Spanish flu pandemic.

Bengaluru, Mar 15: The Karnataka government on Saturday said it would advice IT companies to allow employees to work from home as most coronavirus  affected patients or their relatives were from this sector.

"If anybody (IT companies) asks (employees to work in the office),I will speak to them through the deputy chief minister so that they take steps to issue a definite order. We have very clearly said, Stay Home, stay safe," medical education minister Dr K Sudhakar said. He recalled that the chief minister himself had issued a strict advisory to allow employees work from home.

The minister said the IT sector understands the gravity of the situation because they are educated, have travelled abroad and have more exposure to information world. "No action," he said to a question on what action would be taken against companies who do not follow the instructions.

"There is no action to be taken. We have not promulgated any law. It should be a kind of a cohesive approach from the government and the responsible citizen," he said.

The minister said he had also acted on the advice of Infosys Foundation chairperson Sudha Murty, who had told him that all areas where public and students gather, including malls, theatres, schools and colleges, should be closed.

Sudhakar claimed that the woman whose husband had tested positive for cornavirus here, had flown straight to Delhi from the city and had not come out of Bengaluru airport. He said the newly-wed couple came to Bengaluru airport on March 8 night and early on March 9, she flew alone to Delhi. From there she travelled to Agra by train. She did not come out of the airport, said the minister.

To a question on legal action being contemplated against her, the minister said he would take a call said he was not thinking of legal action at present and would take a call only after the woman, who has also tested positive for the virus, comes out of isolation. He insisted that the purpose of getting details was not to scare people.

On the preparedness in Kalaburagi, where the first Coronavirus death in India was reported, he said the administration had 'clamped down" the entire district. Meanwhile, the deputy commissioner of Ballari district ordered cancellation of tourists' entry to the world heritage site of Hampi from March 15 to 22 to prevent further spread of the virus.