BALTIMORE—Investigators hope an autopsy, a survivor and recording equipment will help explain why a school bus slammed into a commuter bus in Baltimore, killing both drivers and four public transit passengers.
The school bus was a few blocks from its first stop in pre-dawn darkness Tuesday when it hit a cemetery wall, rear-ended a car and then ricocheted off a roadside pillar into the oncoming Maryland Transit Administration bus, police said.
Baltimore police spokesman T.J. Smith said the only school bus passenger, an aide, survived with minor injuries, making her the nearest eyewitness to the 67-year-old school bus driver.
“We’re in the process of interviewing” her, Smith said.

Officials approach the scene of an early morning fatal collision between a school bus and a commuter bus in Baltimore, Nov. 1, 2016. AP Photo/Patrick Semansky