Hackers aligned with Iran have claimed responsibility for a cyberattack on President Trump’s Truth Social platform, according to the cyber nonprofit Center for Internet Security (CIS).

The Iran-aligned hacking group 313 Team took credit for a distributed denial-of-service (DDoS) attack on Truth Social within hours of U.S. strikes on several Iranian nuclear facilities Saturday, a CIS spokesperson confirmed.

Truth Social reportedly saw a surge in reports of problems Saturday night, shortly after Trump posted on the site about the “very successful attack” on the nuclear sites Fordow, Natanz and Esfahan, Wired reported. 

The hack comes as cyberattacks have ramped up amid increasing tensions between Iran, Israel and the U.S.; Iran and Israel have volleyed attacks back and forth in recent weeks following Israel’s surprise attack on Tehran’s nuclear facilities. 

An Israeli-linked hacking group took responsibility for cyberattacks against Iran’s largest crypto exchange last week, transferring more than $90 million out of Nobitex wallets, according to the blockchain analytics firm Elliptic. 

However, the hackers likely did not have the private keys to access the addresses where the stolen funds were sent, meaning they were effectively destroyed. 

The Nobitex hack came one day after the group, known as Gonjeshke Darande or Predatory Sparrow, also claimed responsibility for the hack of a state-owned Iranian bank.