BALTIMORE (AP) - Investigators hope an autopsy, a survivor and recording equipment will help explain why a school bus slammed into a commuter bus in Baltimore, killing six people.
The National Transportation Safety Board is leading the investigation into the Tuesday morning crash that also left 10 people injured.
Baltimore police spokesman T.J. Smith says the 67-year-old school bus driver died, but a female aide who was the only other person aboard that bus survived with minor injuries.
The other people killed were on the Maryland Transit Administration bus, including the driver of that bus.
Smith says the state medical examiner's office may determine if the school bus driver suffered a medical emergency.
He says investigators have recovered recording equipment from one of the buses that may have video of the crash.
