NEW BEDFORD, MASS., JAN. 6 -- At Ma's Donut and Coffee Shop, the Sunday morning ritual of coffee and chatter turned somber as locals tried to understand why a sniper had fired at a school bus and killed a 14-year-old girl.

"A lot of people are talking about it," said waitress Carla Tauaros, 16. "They're frightened."

Many of the waitresses and restaurant patrons knew Robyn Dabrowski. She was killed Saturday when sniper fire bore through a school bus carrying 13 girls to a basketball game at Falmouth.

Susan Arruda, also 14, was injured when she was grazed by the same bullet.

The rear window of a car traveling a few minutes behind the bus on state Rte. 25 near Bourne, 30 miles from here on the western edge of Cape Cod, also was shattered, but the driver was unharmed.

Police today continued searching the woods around state Rte. 25 but said they had not found any spent cartridges believed used by the sniper. Officers also had few clues in the case and had not identified a suspect or established a motive.

Because both the bus and a car were hit, it "virtually rules out any possibility that it was accidental or unintentional," said Plymouth County District Attorney William O'Malley. "The terrible thing about an act like this is that . . . there is no way to take precautions."