Police say Joshua Ryne Goldberg, 20, was talking to a person online identified by law enforcement officials as a Confidential Human Source.

Goldberg gave out information between July and this month about how to make a pressure cooker bomb and fill it with nails, metal and other items dipped in rat poison.

Authorities said he told the person online to place the bomb at a memorial commemorating the Sept. 11 attacks in Kansas City, Missouri.

Several law enforcement agencies are investigating the case, including the FBI's Joint Terrorism Task Force and the Clay County, Fla., Sheriff's Office.

Goldberg was arrested and charged with giving out information on explosives, destructive devices and weapons of mass destruction. If convicted, Goldberg faces a maximum of 20 years in federal prison.