A 37-year-old Illinois man is charged with sending threatening letters to members of Congress containing a white powder, including one with a note reading “HAH enjoy the gift,” according to federal court records.

The criminal complaint unsealed Monday claims Matthew Ungelsbee sent at least four plain white envelopes with a powdery substance to elected officials in Chicago. They were postmarked in Springfield , Illinois, on Oct. 19 and had Unglesbee's name handwritten in the return address section.

Unglesbee, of Quincy in southwestern Illinois, is charged with mailing threatening communications and perpetrating a hoax. He was scheduled to appear in court Monday afternoon. Court records did not list a defense attorney, and a phone number for Unglesbee could not be found. A Facebook message to a Matthew Unglesbee in Quincy was not immediately returned.

FBI agents interviewed Unglesbee at his home on Sunday and he told them all the letters contained salt, court records show.…