San Francisco, Oct 3 : Tendering a fresh apology in the data breach that affected 50 million users, Facebook has said that a detailed investigation found no evidence that the hackers accessed any third-party apps using Facebook Login.

In the biggest-ever security breach after Cambridge Analytica scandal, Facebook last week admitted that hackers broke into nearly 50 million users' accounts by stealing their "access tokens" or digital keys.

"We have now analysed our logs for all third-party apps installed or logged in during the attack we discovered last week. That investigation has so far found no evidence that the attackers accessed any apps using Facebook Login," Guy Rosen, Vice President of Product Management at Facebook, said in a statement late on Tuesday.

Rosen said Facebook has fixed the vulnerability and reset the access tokens for a total of 90 million accounts -- 50 million that had access tokens stolen and 40 million that were subject to a "View As" look-up in 2017.

"Resetting the access tokens protected the security of people's accounts and meant they had to log back in to Facebook or any of their apps that use Facebook Login," the Facebook executive said, adding that "we're sorry that this attack happened".

Any developer using official Facebook SDKs -- and all those that have regularly checked the validity of their users' access tokens - were "automatically protected when we reset people's access tokens".

"However, out of an abundance of caution, as some developers may not use our SDKs, we're building a tool to enable developers to manually identify the users of their apps who may have been affected, so that they can log them out," said Rosen.

The social media giant recommends developers stick to its Login security best practices like using official Facebook SDKs for Android, iOS and JavaScript, using the Graph API to keep information updated regularly and log users out of apps where error codes show that any Facebook session is invalid.

Ireland's Data Protection Commission, which is Facebook's lead privacy regulator in Europe, has asked Facebook to submit more details in the incident where data of over 50 million users were hacked.

The privacy watchdog could fine Facebook as much as $1.63 billion for the data breach.

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Panaji (PTI): As part of a crackdown against tourist establishments violating laws and safety norms in the aftermath of the Arpora fire tragedy, Goa authorities on Saturday sealed a renowned club at Vagator and revoked the fire department NOC of another club.

Cafe CO2 Goa, located on a cliff overlooking the Arabian Sea at Vagator beach in North Goa, was sealed. The move came two days after Goya Club, also in Vagator, was shut down for alleged violations of rules.

Elsewhere, campaigning for local body polls, AAP leader Arvind Kejriwal said the fire incident at Birch by Romeo Lane nightclub at Arpora, which claimed 25 lives on December 6, happened because the BJP government in the state was corrupt.

An inspection of Cafe CO2 Goa by a state government-appointed team revealed that the establishment, with a seating capacity of 250, did not possess a no-objection certificate (NOC) of the Fire and Emergency Services Department. The club, which sits atop Ozrant Cliff, also did not have structural stability, the team found.

The Fire and Emergency Services on Saturday also revoked the NOC issued to Diaz Pool Club and Bar at Anjuna as the fire extinguishers installed in the establishment were found to be inadequate, said divisional fire officer Shripad Gawas.

A notice was issued to Nitin Wadhwa, the partner of the club, he said in the order.

Campaigning at Chimbel village near Panaji in support of his party's Zilla Panchayat election candidate, Aam Aadmi Party leader Kejriwal said the nightclub fire at Arpora happened because of the "corruption of the Pramod Sawant-led state government."

"Why this fire incident happened? I read in the newspapers that the nightclub had no occupancy certificate, no building licence, no excise licence, no construction licence or trade licence. The entire club was illegal but still it was going on," he said.

"How could it go on? Couldn't Pramod Sawant or anyone else see it? I was told that hafta (bribe) was being paid," the former Delhi chief minister said.

A person can not work without bribing officials in the coastal state, Kejriwal said, alleging that officers, MLAs and even ministers are accepting bribes.