HUNTSVILLE, Alabama (AP) - A judge has sentenced an Alabama man to a year in federal prison for tweeting a threat against President Barack Obama.

United States District Judge Lynwood Smith imposed the sentence on Jarvis M Britton during a hearing on Thursday in Huntsville.

Britton must spend three years on probation after finishing the prison term.

The 26-year-old Birmingham man pleaded guilty in March to threatening the president's life. Prosecutors say Britton sent a tweet in September that said, "Let's kill the president. F.E.A.R."

Several people have been linked to a national militia group that prosecutors say was called F.E.A.R. It stands for Forever Enduring Always Ready.