The micro-blogging site, Twitter, was at risk on Thursday as verified accounts of many high-profile users, including former US President Barack Obama and Tesla’s Elon Musk, were hacked to carry out a scam involving cryptocurrency. Twitter has termed the massive hack “a coordinated social engineering attack” and assured its users that they are “working hard to make this right”.

“Tough day for us at Twitter. We all feel terrible this happened. We’re diagnosing and will share everything we can when we have a more complete understanding of exactly what happened. Love to our teammates working hard to make this right,” Twitter CEO Jack Dorsey said in a tweet.

The verified accounts of people like Obama, Musk, investor Warren Buffet and Amazon’s Jeff Bezos, were hacked by scammers to defraud users into sending cryptocurrency bitcoin. Twitter then decided to disable the tweeting ability of many such accounts for about two hours.

Earlier, Musk’s Twitter handle was hacked and reading a tweet: “Happy Wednesday! I am giving back Bitcoin to all of my followers. I am doubling all payments sent to the Bitcoin address below. You send 0.1 BTC, I send 0.2 BTC back!” The offer was valid “only for 30 minutes”.

The US presidential candidate Joe Biden, reality TV show star Kim Kardashian, rapper Kanye West and Microsoft co-founder Bill Gates were other known victims of the massive hack.