The National Transportation Safety Board also believes weather could have been a factor in the crash, but warns it is too early to determine the cause.
Three months into a four-year contract, the problems are mounting for Newcastle boss Matthias Jaissle after his side were booed off the pitch by their own fans following another defeat.
Newcastle United head coach Matthias Jaissle takes issue with referee John Brooks' decision not to call a "clear foul" on Fabian Schar in the build-up to Thierno Barry's goal in their loss to Everton in the Premier League.
Everton manager David Moyes' post-match reaction to his side's one-goal win against struggling Newcastle United, as well as the availability of Jack Grealish following disciplinary action.
Thierno Barry scores against Newcastle United for the second time in five days as his Everton side earn a narrow win at St James' Park in the Premier League.
Some seven years after supposedly retiring from coaching, Joe Schmidt still shows no sign of stepping away from rugby as he prepares for month-long stint in Ulster.