Charlestown Man arrested

A group of seven descended on a man and woman walking in Downtown Crossing Friday night and stopped beating the man only when they heard police sirens approaching, the Suffolk County District Attorney's office reports.

Three men - Ayanle Mohamed, 24, of Charlestown, Liban Dualle, 21, of Roxbury, and Nur Herson, 23, of Roxbury, were arraigned today on charges of assault and battery and disorderly conduct. Mohamed was also arraigned on charges of Class B and D drugs. A 17-year-old from Dorchester was arraigned in juvenile court yesterday, the DA's office reports. Three other people remain at large.

During booking, officers discovered a bag of cocaine in Mohamed’s change pocket and marijuana in his sock, prosecutors said.