A Dorchester man convicted of a firing a gun at a Boston cop in 2006 faces arraignment Friday on new charges that he fought and injured a Boston Police sergeant during an arrest off Talbot Avenue this week, the Suffolk County District Attorney's office reports.

Calvin Horne, 26, was in the process of being arrested around 1:50 a.m. at Colonial Avenue and Millett Street when he turned violent and grabbed at one officer's gun, the DA's office reports.

Stanley Stacos tweeted what happened next: "OFFICER IN TROUBLE Colonial Ave at Millet St, Boston Police Sgt screaming for HELP, Multiple Units flying in."

According to the DA's office, the sergeant suffered injuries to his head and ear.

Once taken into custody, police found two dozen bags filled with suspected crack cocaine on Horne, the DA's office says.

Horne will be arraigned in Dorchester District Court on a variety of drug, gun and aggravated assault and battery charges, the DA's office says.

In 2006, police officers who heard gunfire near Langdon Street in Roxbury spotted Horne fleeing the scene. When they began to chase, he paused and fired a shot at one of the officers - who fired back. Neither was injured. Horne was convicted in 2009 and sentenced to three to four years in prison, the DA's office reports.