A young Florida man accused by the FBI of sending bomb-making plans to an informant for an attack at a 9/11 anniversary event in Missouri will undergo psychological evaluation.

Joshua Goldberg appeared in federal court Tuesday in northeast Florida. The judge sent him to a mental health facility in North Carolina for 30 days.

The 20-year-old who lived with his parents was arrested last week after catching authorities' attention earlier this year in online posts under the moniker "Australi Witness," and others.

The FBI said Goldberg called for an attack on a contest for drawings of the Prophet Muhammad in Garland, Texas, and boasted about helping plan attacks on synagogues in Australia.

The FBI says Goldberg sent instructions to an informant showing how to make a pressure cooker bomb.