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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 8: Karnataka recorded 308 new COVID-19 cases in the past 24 hours, with the majority of patients being domestic returnees, raising the state's tally to 5,760 an official said, here on Monday. "Over 308 new cases were reported from Sunday 5 pm to Monday 5 pm," said the health official.

Like everyday Maharashtra returnees accounted for 96 per cent (267 cases) of the 277 new cases. Majority infections in Karnataka nowadays are returnees, mostly from the state's northern neighbour.

A few returnees also came from Tamil Nadu, Telangana and Andhra Pradesh. There was one international returnee, a 23-year-old man from Dakshina Kannada, who came from the UAE. Only 24 new infections were contacts of earlier cases.

On Monday, cases spiked in Kalaburagi, Yadgir, Bidar, Udupi, Bengaluru Urban, Ballari and Gadag.

Among the new cases, Kalaburagi contributed (99), followed by Yadgir (66), Bidar (48), Udupi (45), Bengaluru Urban (18), Ballari (8), Gadag (6), Shivamogga and Dharwad (4 each), Hassan and Dakshina Kannada (3 each), Bagalkote (2) and Koppal and Ramnagar (1 each). Four patients are suffering from Influenza-Like Illness (ILI).

Meanwhile, record 387 patients got discharged in the past 24 hours. On Monday, three persons - A 67-year-old man, a 48-year-old woman and another 65-year-old woman, all from Bengaluru Urban, succumbed to coronavirus.

Of all the cases, 3,175 are active, 2,519 discharged, 64 dead and 14 in the ICU.

In the past 24 hours, Karnataka tested 8,779 people. Of this, 8,231 reports returned negative. A number of tests were lower than other days. In total, 3.93 lac samples have been tested so far, of which 3.8 lac have returned negative.

Currently, Udupi is leading the state's COVID-19 burden with 628 active cases, followed by Kalaburagi (539), Yadgir (488), Raichur (276) and Bengaluru Urban (176) among others.

Bengaluru Urban has accounted for 18 deaths, followed by Kalaburagi (7), Bidar, Vijayapura, Davangere and Dakshina Kannada (6 each) and Chikkaballapur (3 each), among others.

Bengaluru, June 23: A head constable from Karnataka State Reserve Police (KSRP) committed suicide on board a bus after testing positive for COVID-19 in the city.

As per sources, the 50-year-old head constable had tested positive for coronavirus last evening and today he was being taken to a hospital in KSRP bus.

It is learned that he hanged himself to death inside the bus as there was no one else.