The hashtag \"#hacked\" quickly rose to the top of trends on the site Wednesday afternoon.

The apparent scam message asked users to send Bitcoin, which would then be doubled.

\"I am giving back to the community. All Bitcoin sent to the address below will be sent back doubled! If you send $1,000, I will send back $2,000. Only doing this for 30 minutes,\" the message read on the hacked accounts.

Biden's campaign quickly responded to its account being hacked.

“Twitter locked down the account immediately following the breach and removed the related tweet. We remain in touch with Twitter on the matter,” the campaign said in a statement to ABC News.

\"PHOTO:
@joebiden/Twitter
PHOTO: A screenshot shows a tweet posted to Joe Biden's Twitter account after an alleged hacking.
>

The Department Of Homeland Security’s cyber arm, the Cybersecurity and Infrastructure Security Agency, referred questions to Twitter and said it had no further comment.

FBI's San Francisco field office, which covers Twitter's headquarters, offered a statement.

\"We are aware of today’s security incident involving several Twitter accounts belonging to high profile individuals,\" it said. \"The accounts appear to have been compromised in order to perpetuate cryptocurrency fraud. We advise the public not to fall victim to this scam by sending cryptocurrency or money in relation to this incident.\"

A Secret Service spokesperson told ABC News, \"The U.S. Secret Service is aware of a suspected hacking incident related to social media accounts. As a matter of practice, the Secret Service does not confirm the existence or absence of ongoing investigations.\"

Rep. Alexandria Ocasio-Cortez, D-N.Y., immediately warned people not to take part in the scam.

Hey everyone - there seems to be a large Twitter attack right now targeting large accounts.

Please be vigilant about any bitcoins scams and do NOT click on any suspicious links.

Just in case, if my account tweets any bizarre links related to cryptocurrency, do NOT click on it.

— Alexandria Ocasio-Cortez (@AOC) July 15, 2020

ABC News' Molly Nagle, Luke Barr, Catherine Thorbecke and Marc Nathanson contributed to this report.

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