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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, Apr 21: The group who had attacked police and healthcare workers at the minority-dominated Padarayanapura in the city on Sunday night had raised slogans ''kill police'' when the team went to quarantine some people, the police alleged in an FIR.

Around 100 to 120 people rushed out onto the road targeting the police and health workers who wanted to pick up primary and secondary contacts of coronavirus patients.

Cases have been registered against the miscreants based on the complaint of police officers.

In one of the FIRs, police sub-inspector Raman Gowda complained that when he went to quarantine 43 people with the healthcare officers, around 120 people rushed out and attacked them.

"The group of people holding sticks and stones rushed from Arafat Nagar," Mr Gowda said.

When he was trying to stop them from destroying a CCTV camera, the mob attacked him shouting slogans ''Kill the police. Don't spare them," he alleged in the FIR.

"They wanted to kill us with stones and sticks and some of our staff sustained injuries," the officer said.

According to police, 59 people have been arrested including A woman who had allegedly masterminded the attack.