A 10-year-old Bethesda girl was killed yesterday afternoon when a delivery van crossed a median on I-95 in Howard County and struck her family's car, Maryland state police said.

Magdalene Law of 9513 Singleton La. was a passenger in the rear seat of a 1982 Chevrolet Cavalier driven by her mother, Polly Law, 39, when it was struck in the southbound lanes of I-95 just north of Montgomery Road in Elkridge, Md., police said.

The girl was pronounced dead at the scene, police said. Her grandmother, Shuyun Young, 77, and her 6-year-old brother, Timothy Law, were taken to St. Agnes Hospital in Baltimore after the 4:15 p.m. crash, as was Polly Young, police said. Hospital officials said they were all treated and released.

A Chevrolet step-van owned by the Herr's potato chip company and driven by Joseph Edward Renehan, 26, of Baltimore County was traveling north on I-95 when, for unknown reasons, it cut across the median and two lanes of traffic before striking the Laws' car, police said. Police said the accident was still under investigation.

Renehan was treated and released at St. Agnes Hospital. Safety belts were worn by all of the people involved in the crash, police said.