New Delhi: Private data of over 5.6 lakh Indian Facebook users was compromised by a private marketing firm that later sold the personal details acquired through a quiz app to Cambridge Analytica, a UK-based company at the centre of a global privacy breach storm.

The social media giant informed the Indian government on Thursday about the details of compromised accounts in response to a notice over the user data breach and details of the steps Facebook was taking to ensure safety and prevent misuse of personal data.

A Facebook spokesperson, sharing the response with IANS, said a possible breach of data of 562,455 users happened after 335 Facebook users in India installed a quiz app, "thisisyourdigitallife" between November 2013 and December 2015.

The app, developed by University of Cambridge psychology researcher Aleksandr Kogan and his company Global Science Research, pulled out data of not only these 335 users but their friends as well as friends of friends also.

Some 335 people in India were said to have installed the app, which is 0.1 per cent of its total worldwide installs. But this information is limited to people who installed the app throughout its lifetime on the Facebook platform -- from 2013 to December 2015 -- when it was suspended from the platform.

The social media giant, however, did not reveal the identity or locations of these 335 users.

From Monday, Facebook will inform all 562,455 users that their account privacy had been breached through a link at the top of their news feed so they can see what apps they use and the information they have shared with those apps.

Facebook also doesn't know how Cambridge Analytica and Global Science Research used the data of Indian users because the firms are not its downstream affiliates and may have made independent decisions regarding the data they obtained. This, Facebook said, was "not authorize(d) and breached our policies".

Ankush Johar, Director at Infosec Ventures -- security solutions firm – said, "The quiz app 'thisisyourdigitallife' is not the only application that had hidden data-scraping functionalities and many other apps were exploiting these so-called 'features' provided by Facebook which the company confirmed itself.

"If as small as 350 users in a single app can lead to leakage of over 5 lakh users, the true number can be exponentially bigger than this," Johar added.

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London, Nov 22: A bomb disposal squad deployed as a “precaution” to the South Terminal of Gatwick Airport concluded an investigation into a "security incident" on Friday after making a “suspect package” safe.

The South Terminal of Gatwick Airport, the UK's second busiest airport after Heathrow, which was briefly shut owing to the incident reopened following the incident.

The Gatwick is around 45 km south of London.

Two people detained during the enquiries have since been allowed to continue their journey as the airport was opened.

“Police have concluded their investigation into a report of a suspect package at Gatwick Airport. Officers from the EOD (Explosive Ordnance Disposal) team made the package safe, and the airport has been handed back to its operator,” Sussex Police said in an updated statement.

“Two people detained while enquiries were ongoing have subsequently been allowed to continue their journeys. There will remain an increased police presence in the area to assist with passengers accessing the South Terminal for onward travel,” the statement added.

Earlier on Friday, the incident caused severe disruption at the busy airport’s South Terminal, while the North Terminal of Gatwick Airport remained unaffected.

“Police were called to the South Terminal at Gatwick Airport at 8.20 am on Friday (November 22) following the discovery of a suspected prohibited item in luggage,” a Sussex Police statement said.

“To ensure the safety of the public, staff and other airport users, a security cordon has been put in place whilst the matter is dealt with. As a precaution, an EOD (Explosive Ordnance Disposal) team is being deployed to the airport. This is causing significant disruption and some roads around the South Terminal have been closed. We’d advise the public to avoid the area where possible,” it said.

Footage on social media taken outside the airport showed crowds of frustrated travellers being moved away from the terminal building.

Gatwick said it was working hard to resolve the issue.

“A large part of the South Terminal has been evacuated as a precaution while we continue to investigate a security incident," the airport said in a social media post.

“Passengers will not be able to enter the South Terminal while this is ongoing. The safety and security of our passengers and staff remain our top priority. We are working hard to resolve the issue as quickly as possible.”

Train and bus services that serve the airport were also impacted while the police carried out their inquiries.

In an unrelated incident in south London on Friday morning, the US Embassy area in Nine Elms by the River Thames was the scene of a controlled explosion by Scotland Yard dealing with what they believe may have been a “hoax device”.

“We can confirm the 'loud bang' reported in the area a short time ago was a controlled explosion carried out by officers,” the Metropolitan Police said in a post on X.

“Initial indications are that the item was a hoax device. An investigation will now follow. Some cordons will remain in place for the time being but the majority of the police response will now be stood down,” it added.