Authorities said Kermit Poulson sent threats on Instagram with the intent to extort Portland's mayor.

A man was indicted in federal court on Wednesday for sending threats on Instagram with the intent to extort Portland Mayor Ted Wheeler, authorities said.

Kermit Tyler Poulson, 39, was arrested in Missoula, Montana, on Tuesday after visiting the city’s police department to file an unrelated complaint. Missoula police arrested Poulson after learning he had a federal arrest warrant.

Poulson recently lived in Portland, but has no known permanent residence, according to the U.S. Attorney’s Office for the District of Oregon.

If convicted, Poulson faces a maximum sentence of two years in prison and a $250,000 fine.