San Franscisco/Tokyo: Sony Corp's PlayStation Network was back online on Monday following a cyber attack that took it down over the weekend, which coincided with a bomb scare on a US commercial flight carrying a top Sony executive.
Sony said on its PlayStation blog that the network had been taken down by a denial-of-service-style attack, which overwhelmed the system with traffic but did not intrude into the network or access information of its 53 million users.
Meanwhile, the Federal Bureau of Investigation (FBI) said it was investigating the bomb threat that caused an American Airlines flight to be diverted.
A Twitter account with the handle @LizardSquad claimed responsibility for Sunday's attack and said it was meant to pressure Sony to invest more in the network.
"Sony, yet another large company, but they aren't spending the waves of cash they obtain on their customers' (PlayStation Network) service. End the greed," one post said.
Sony's was the victim of a 2011 breach that compromised data of tens of millions of PlayStation Network users, dealing a major blow to plans for a looser network designed to allow for the connection of a range of Sony devices.