Story highlights Two Australian surfers are feared dead after their burned van is found in Mexico

Families head to Mexico to identify bodies reportedly discovered in the van

(CNN) Fears are growing over the fate of two Australian surfers missing in Mexico following the grim discovery of human remains and a burned-out vehicle registered to one of the men.

Dean Lucas and Adam Coleman, both 33, had been missing for over a week when a van was discovered in the state of Sinaloa -- an area known as the home of the Sinaloa drug cartel.

The men, from near Perth in Western Australia, had been on a surfing trip from Canada to Mexico and were due to arrive in the city of Guadalajara on November 21, but they never showed up.

Foreign Minister Julie Bishop said Tuesday that the Australian government has "very grave concerns for their fate."

Two Australian surfers missing in Mexico: Adam Coleman and Dean Lucas (pictured with girlfriend Josie Cox).

"Our consular staff have been working around the clock to determine their whereabouts," she said in an interview with Nine Network's Today show. "A vehicle registered in the name of one of the Western Australian men has been located. There are human remains and these are yet to be formally identified.

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