A Modesto man accused of being an ISIS sympathizer has been arrested after allegedly plotting a terror attack targeting San Francisco’s Pier 39 – a top tourist destination – on Christmas Day.

The allegations are made in an 11-page affidavit filed in federal court in Fresno on Friday and obtained by the New York Times. CNN confirmed the authenticity of the document.

After an FBI investigation, Everitt Aaron Jameson, a 26-year-old former U.S. Marine, was arrested and charged Friday with attempt to provide material support to a foreign terrorist organization.

He made his initial appearance at U.S. District Court in Fresno Friday afternoon, and is expected to return on Dec. 28, the Fresno Bee reported.

Jameson’s attorney Eric Kersten, a federal public defender, said after the hearing that his client denied the allegation in a federal complaint accusing him of one count of violating the federal law making it illegal to provide material support to a foreign terrorist organization.

He will enter a plea at another court date, he said.

Magistrate Barbara McAuliffe set a date of Dec. 28 for a detention hearing to discuss the condition of release. She also set a preliminary hearing for Jan. 5, but that’s considered a formality because it is expected that an indictment will be issued by then, Kersten said.

Dentention hearing set for Dec. 28. Federal public defender says indictment expected by Jan. 5.

A spokeswoman for the FBI’s San Francisco office said she couldn’t comment on the case specifically.

“There is no specific or credible threat to the Bay Area. I can’t provide any other comment at this time,” FBI spokeswoman Katherine Zackel said.