The driver of an SUV involved in a fiery crash with a National Defence Navy bus near Halifax, N.S. has died, police have confirmed.

The head-on crash happened on a two-lane stretch of Hwy. 107 about 1 kilometre south of Cole Harbour around 9:45 a.m. local time Friday morning.

By the time police arrived, both the SUV and the bus were engulfed in flames.

Police found several witnesses that were helping the three men that were in the bus, and believe the witnesses pulled the victims out.

RCMP Cpl. Joe Taplin said in a phone interview with CTV.ca that the woman driving the SUV was killed, and has not yet been identified.

He said the preliminary investigation has found that the bus was going northbound, when the southbound SUV suddenly crossed over the centre line and passing lane, and finally stopped when it hit the bus.

The SUV "would've actually crossed the double solid line into the northbound lane," Taplin said.

The highway will be closed off for the rest of the afternoon as investigators figure out what happened.

"It's quite bright, perhaps one of the drivers was blinded, but it looks like one vehicle was trying to pass," CTV's Atlantic Bureau Chief Todd Battis reported.

Taplin said it is still unclear as to where everyone involved in the crash was going when it happened.

A Department of National Defence spokesperson referred all calls to the RCMP.