15 died when bus crashed home from school in Connecticut . Washington ( CNN ) -- NTSB said bus driver was ` ` impaired by sleep deprivation , '' had been speeding . Last year , bus driver pleaded not guilty to charge of speeding .
15 died when bus crashed home from school in Connecticut . NTSB said bus driver was ` ` impaired by sleep deprivation , '' had been speeding . Last year , bus driver pleaded not guilty to charge of speeding .