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Boston Police report four teenagers were sitting on the steps at 85 Trenton St. around 2 this morning when another teen in a group walking by them came at them with a knife. At the end of the fight, two victims were taken to Boston Medical Center with life-threatening injuries; two others were taken to Mass. General with less severe wounds.

Roberto Soto, 18, of East Boston, was arrested and charged him with assault and battery by means of a dangerous weapon and assault with intent to murder; police say they are continuing to investigate the incident.

Soto is not unfamiliar with Boston Police. On May 20, 2007, he was arrested on charges of mugging somebody outside a Meridian Street convenience store, allegedly warning "something bad" would happen if the man didn't hand over a 12-pack of beer.