A Massachusetts man was arrested on a "threat-related charge," the U.S. Attorney's Office said Thursday.

Brandon James Ziobrowski, of Cambridge, was arrested and charged with making a threat.

According to U.S. Attorney Andrew Lelling, Ziobrowski, 33, tweeted "I am broke but will scrounge and literally give $500 to anyone who kills an ICE agent. @me seriously who else can pledge get in on this let's make this work."

"Over time, Ziobrowksi's tweets have become more violent and threatening," the indictment read. "He has repeatedly tweeted his desire to 'slit' Senator John McCain's throat."

Federal prosecutors called the tweet referring to an Immigration and Customs Enforcement officer specific and serious.