PITTSBURGH — A Pennsylvania man was scheduled to plead guilty today to using the Internet to promote terror attacks against American military and civilian targets in posts he made on an Islamic extremist Web forum he moderated. He also will plead guilty to having a loaded pistol when he allegedly bit two FBI agents who tried to question him.

Online federal court records show Emerson Begolly, 22, signed an agreement last week to plead guilty to one count of solicitation to commit a crime of violence. That charge was brought by a federal grand jury in Alexandria, Va., in July, but was transferred to the U.S. District Court in Pittsburgh so he could plead guilty to it at a change of plea hearing on other charges prompted by the alleged biting incident in New Bethlehem in January.

A court official with knowledge of the Pittsburgh charges confirmed that Begolly will plead guilty to a single charge of possessing a firearm while committing a crime of violence — that is, having a gun when he allegedly bit the agents. The official requested anonymity because the plea won’t be formally entered until this afternoon.

The charge of soliciting to commit a crime of violence, out of Virginia, carries up to 10 years in prison, while the weapons charge in Pennsylvania carries up to a life sentence, though it’s exceedingly rare for defendants to plead guilty to such a charge without some assurance of less than a life sentence.

Assistant federal public defender Marketa Sims of Pittsburgh represents Begolly on both sets of charges, but declined to comment until today’s change of plea hearing before Senior U.S. District Judge Maurice B. Cohill Jr.