A Minneapolis man who threatened to "whack" U.S. Attorney Andrew Luger and FBI agents in April in connection with an ongoing terrorism investigation in the Twin Cities pleaded guilty Monday to a misdemeanor charge of assault.

Mahamed Abukar Said, a friend of several defendants who were indicted last spring for conspiring to support terrorists in Syria linked to the Islamic State in Iraq and the Levant, originally was indicted on a felony charge for tweeting threats to harm federal authorities involved in the investigation.

In various tweets, Said, 20, wrote: "Ima whack that us attorney general. The Feds are getting two choices. Either they gon free mybros or they gon have a massacre happen then they gone take me too. Ill kill for these guys if they don't free my brothers"

To avoid a conflict, Luger's office referred the case out for prosecution to the U.S. attorney's office in the Western District of Wisconsin. Said is being held in the Anoka County jail. No sentencing date has been set.

So far, three of the eight men originally charged with conspiring to support terrorism have pleaded guilty.