Cyrus bus driver 'suffered cardiac arrest'

The driver who crashed Miley Cyrus's tour bus suffered a cardiac arrest moments before the accident, new reports claim.

The vehicle was flipped while travelling to a gig in Greensboro, NC last week, killing operator Bill Douglas and injuring nine others.

According to Access Hollywood, who claims to have obtained a leaked emergency phone call, Douglas may have been experiencing heart problems prior to the tragedy.

In the clip, a caller is heard telling medical authorities: "RV flipped over. The man just went into cardiac arrest. We are going to need some help soon."

After the incident, the Cyrus family issued a statement saying that they are "deeply saddened" by Douglas's death.