Security firm Symantec was also reportedly hacked and is currently investigating the situation, according to the BBC. The company has taken “each and every claim” of an attack on its systems seriously. “Our first priority is to make sure that any customer information remains protected,” the company said in a statement to the BBC.

On Sunday night, NBC’s website was hacked by an individual working under the username “pyknic,” reported. Saturday Night Live, Jimmy Fallon and Jay Leno portals were hacked, as was NBC’s main page.

The pages were defaced with scrolling text that read: “Remember The Fifth of November, The Gunpowder Treason and Plot. I know of no reason why the gunpowder treason should ever be forgot.” The rhyme refers to Guy Fawkes’ failed attempt to blow up the House of Lords and kill King James I on Nov. 5, 1605.

Lady Gaga fansite was also hacked by “pyknic,” BetaBeat reported.

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