BETHESDA, Md. — Autopsy results confirmed the driver of a tour bus that crashed along Interstate 270 last week died of a heart attack just before the bus tumbled down a 45-foot embankment, according to The Washington Post. Passengers reported that the driver, Joseph A. Clabaugh, was sweating profusely prior to the accident. All 11 passengers — five adults and six children — survived. For the full story, click here.