Already facing several charges in connection withabortion clinic shootingsin two states, John C. Salvi III was indicted today on federal charges of transporting a firearm across state lines for violent purposes. A Boston grand jury returned a two-count indictment, each of which carries a maximum penalty of 10 years in the slammer and $250,000 in fines. Other charges are expected to follow. Salvi is accused of killing two clinic workers in Massachusetts on Friday and firing a hail of bullets at a Norfolk, Virginia clinic on Saturday. He is currently being held without bail in Virginia; prosecutors have agreed to extradite him to Massachusetts to stand trial there first.