The Chevy van in which two bodies were found burnt beyond recognition and which was left alongside a back road amid remote farmlands of Sinaloa state was registered to Adam Russell Coleman, as the state's attorney-general named him.

Key points: Burnt-out van belonging to WA surfers found with two bodies inside

Burnt-out van belonging to WA surfers found with two bodies inside Authorities so far have released no information on identity of bodies

Authorities so far have released no information on identity of bodies No information yet on last sightings of Australians

No information yet on last sightings of Australians Local newspaper editors say area too dangerous to send reporters to investigate

That was the only official information released on Tuesday by the Mexican authorities investigating the disappearance, presumed death, of Australian surfers Dean Lucas and Adam Coleman on November 21.

Sinaloa's governor Mario López Valdez described the case as a "mala nota" — a black mark against a state plunged deep in a violent and vicious drug war that provides corpses on a regular basis.

"It seems this has left us cold in our tracks and it saddens us... but we will clear this all up and find those responsible," Mr Valdez was quoted as saying in the Noroeste newspaper.

Sinaloa state attorney-general Marco Antonio Higuera Gomez has asked for a second investigative team to be established, made up of members of the state's security forces.

The DNA from the bodies in the burnt Chevy will be sent to the national forensics laboratory to speed up the investigation.

The PGJE investigative police could provide no more information about their investigation.

Three different newspaper editors told me they also had no more information to share, other than that on the day the van was found it was too dangerous for their reporters to go into any of the nearby communities of this remote location to ask for witnesses, such is their fear of operating outside the major cities.

The threat is that their cars can be stolen from them and their lives taken just for being in the wrong place.

Adam Coleman (left) and Dean Lucas were en route to Guadalajara. ( Supplied )

We still have no official confirmation yet as to the last sightings of the Australians.

The attorney-general told local media the Australians had caught the ferry from Baja California to Topolobampo on Friday, November 20.

But when I called the company they would only confirm the ferry arrived at between 9:30pm and 10:30pm.

The journey from there to Guadalajara is 900 kilometres by a toll highway. The Australians' van didn't make it even a quarter of the way.

Investigators are now believed to be checking security cameras at the toll booths of Guasave or Alhuey Angostura, as well as those on the outskirts of Los Mochis (the first city on the route just past the ferry stop).

It was at Los Mochis that a last sighting was reported by Associated Press from a comment made by an unnamed source to Adam Coleman's girlfriend Andrea Gomez that he was seen in an Oxxo 24-hour supermarket with Dean Lucas buying a map late that Friday night.

I haven't been able to confirm that — the Oxxo supermarkets are family-run affairs that use cell phones these days, I was told. None of the half dozen landlines I called answered.

As for the highway the two Australians set out on, a local told me there is no guarantee of one's safety on that road.

It's well-known by locals for gangs of armed men looking to rob travellers.

What hope did a van with foreign number plates and two Australians have?