The Secret Service is investigating whether Anonymous really hacked Donald Trump

The Secret Service said Friday that it is investigating claims that the internet hacking collective Anonymous obtained Donald Trump's personal information, including his alleged Social Security number and his cell phone number.

"The U.S. Secret Service is aware of the internet postings of candidate Donald Trump's personal information," Secret Service spokesman Martin Mulholland said in a statement. "We are working with the Federal Bureau of Investigation in this matter."

The alleged disclosure of Trump's personal information in a YouTube video comes just days after Anonymous declared "total war" on the Republican frontrunner, citing his "deeply disturbing" behavior. The video, which marks the group's first hit against Trump in its promised string of attacks to take him down, slams him for an "agenda of fascism and xenophobia, as well as the religious persecution of Muslims through totalitarian policies."

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Along with Trump's alleged Social Security and cell phone numbers, the group also offered up the personal information of Trump's spokesperson, campaign manager, and some of his family members, though some of the information was already public and other information is reported to be out of date.

Trump spokeswoman Hope Hicks confirmed that "the government and law enforcement authorities are seeking the arrest of the people responsible for attempting to illegally hack Mr. Trump's accounts and telephone information."