2 September 2010 Last updated at 13:12 ET

Sisters' tanker crash deaths in Cornwall 'a mystery'

Janis Cusworth and Carol Jiggins died from "horrific" multiple fractures

The cause of a petrol tanker crash in Cornwall which killed two sisters will remain "a mystery", a coroner has ruled.

Janis Cusworth, 61, and Carol Jiggins, 60, from Newquay, died in the head-on crash near Hayle in February.

The Rover car they were in veered across the A30 into the tanker's path.

Investigators said no vehicle defects were found and both women were in good health. Deputy Coroner Barrie Van den Berg ruled the deaths were accidental.

Ms Jiggins had been driving the car they were both in, travelling westbound towards the Loggans Moor Roundabout on 24 February when the crash happened.

The inquest in Truro heard the women died from "horrific" multiple fractures as a result of the crash.

Police told the inquest that nothing had been found to suggest the car was defective in any way that would have caused it to cross the carriageway in the way it did.

The inquest also heard that the tachograph from the tanker showed that it had been travelling at 46mph, 6mph faster than the speed limit, but not fast enough to have made the accident "any more survivable".

Mr Van den Berg ruled verdicts of accidental death saying the accident was wholly because of the actions of the car driver, but that the reason for it crossing the road in the way it did was "a mystery."