Two West Australian brothers have vanished while on a surfing trip to Mexico, sparking a desperate search.
Jake and Callum Robinson are believed to have gone missing in the Baja California region near Ensenada on Mexico's north-west coast.
After sharing regular social media posts about the first two days of their trip, they have made no contact for four days.
According to Mexican local media reports, a Special Operations Group have been dispatched to join police in their search for the missing brothers.
Jake Robinson, a doctor, was visiting his brother who is a lacrosse player based in San Diego in the United Sates and the keen surfers had made the trip to Mexico with another friend.
The brothers' family are reportedly trying to arrange travel to the region to look for them.
Jake and Callum Robinson have not been heard from for days after going on a surfing trip to Mexico (pictured with their parents)
The pair are understood to have gone missing from the Baja California region near Esenada
Local news outlet En Contraste reported that authorities tracked the phone of one of the brothers which they found being held by a woman who is in custody.
The pair's mother, Debra Robinson, has issued a plea for help on social media.
'Reaching out to anyone who has seen my two sons,' she wrote.
'They have not contacted us since Saturday 27th April. They are travelling with another friend an American citizen.
'They were due to book into an Airbnb in Rosarito after their camping weekend, but they did not show up.
'Callum is type one diabetic, so there is also a medical concern.'
The third man in their group, Jack Carter Rhoad, is also missing.
Jake and Callum Robinson (left) shared social media posts about the first two days of their Mexico trip (right) but they have not been heard from for four days
Jake had been visiting Callum, a lacrosse player based in San Diego, when they took the trip to Mexico with a friend
WA Premier Roger Cook said it was a concerning situation.
'This is obviously must be very worrying for the family involved,' he said.
'When we do send our young men and women overseas to enjoy that adventure holiday they invite an element of risk and this is really quite distressing,' he said.
'I understand that one of the individuals has a medical condition that would need ongoing care. So I share the concerns of all Western Australians in terms of their welfare.'
More to follow.