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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.

Mangaluru, Jun 11: City police on Thursday filed a 700-page chargesheet in connection with the arrest of Aditya Rao, 36, accused of planting an IED at Mangaluru International Airport on January 20.

The chargesheet said the bag placed near MIA entrance had a real bomb, as per the FSL report. The IED in the tin box was made of sulphur, ammonium nitrate, potassium chlorate and charcoal.

Rao, an engineer, who learnt bomb-making through online videos, had also placed a timer along with it and sharp objects such as nails and metals. However, he had not fixed wires to trigger a blast. “His intention was not to cause a blast but only to create a scare,” said sources.

The bomb was made in less than two weeks. However, it had taken Rao several days to procure raw materials. Police had completed the chargesheet process in April.

Bengaluru, Jan 30: There are around 3 lakh Bangladeshis across Karnataka and around 3,000 of them left Bengaluru following the recent crackdown, according to Bhaskar Rao, Bengaluru city police commissioner.

It's the first time a high-ranking official has put a number to Bangladeshis in Karnataka following the debate over the new citizenship law.

At a conclave on 'Construction Workers Safety, Health and Welfare' organised by the labour department and IIMB here, he said the estimate was arrived at based on information sourced from Bangladeshis deported recently.

There's been no study to ascertain the Bangladeshi population in the state, Rao said, adding that most illegal Bangladeshis in Bengaluru are victims of human trafficking.

"They come to Bengaluru for employment. Unlike other cities, Bengaluru has a lot of job potential and pays good salaries too. There are a lot of Bangladeshis working in the construction industry," Rao said.

Workers from Bangladesh demand lower wages. While other labourers demand around Rs 500 to Rs 600 per day, Bangladeshi workers don’t complain about being paid around Rs 100-150,” Rao said, adding that this has encouraged human traffickers to increasingly bring in Bangladeshis.

Suresh Hari, chairman, Confederation of Real Estate Developers Association of India, however, said they’re not aware of the nationality of their workers as contractors bring workers registered for tasks. “It’s difficult to say where they are from as there’s also construction work outside Credai’s purview,” Hari said.