A Philadelphia woman was among four passengers killed in a bus crash early Tuesday in Virginia, authorities said.

Sie Giok Giang, 63, was riding on the Sky Express Bus headed to New York's Chinatown when it overturned on I-95 between Richmond and Fredericksburg at 4:55 a.m., the Virginia State Police said.

Twenty passengers remained hospitalized Wednesday. All of the 53 surviving passengers were injured. The driver, Kin Yiu Cheung, 37, of Flushing, N.Y., was charged with reckless driving. Federal regulators on Tuesday halted Sky Express Bus from operating, citing multiple violations. The cause of the crash is under investigation. - Robert Moran