Hidden clues uncovered in search for missing Aussie brothers Jake and Callum Robinson as parents travel to Mexico

Images showing the possible last known location of missing Australian brothers Jake and Callum Robinson could prove key as their parents travel to Mexico to help search efforts.

Images posted to social media showing the possible last known location of missing Australian brothers Jake and Callum Robinson have been unearthed as the parents travel to Mexico to help out with the investigation.

The pair had talked about the famous surf break for weeks before they set out from the United States on their ill-fated cross-border road trip adventure to Mexico.

Together with their American friend Jack Carter Rhoad, the trio in their Chevy pickup with their boards in the back drove the one and a half hour journey to the K38 site, so named for the collection of surfing breaks at the 38km mark along the Baja Highway on the Baja California peninsula.

It is a well known area, popular with locals and American surfers particularly as it was so close to the border.

The trio pitched their tents nearby for what was only supposed to be a short break, with all three having work and other commitments to get back to.

Callum and Jake Robinson are believed to have gone missing in the Baja California region near Ensenada while on a surfing and camping trip. Picture: Facebook

They posted excitedly about their journey for two days and then last weekend on April 27 the posts stopped, contact was cut and a family on the other side of the world appealed for help.

But recent social media posts from one of the Perth brothers missing in Mexico have been uncovered, showing the beach the pair were reportedly last seen.

The unearthed posts give insight into the final hours before Callum, 33, and Jake, 30, went missing in Mexico.

Instagram stories from Callum’s account showed highlights from the group’s trip across the country, even picturing the beach where the pair were last seen on a surf trip.

Friends of the missing brothers have put callouts on social media asking people help search for them.

Perth man Callum Robinson (pictured) and his brother Jake are missing.

More than 100,000 people in Mexico are listed as “desaparecidos” or missing every year.

Two blokes from Perth and an American buddy would not be among them, the family was assured on social media by those responding to their pleas for help, as the area was notorious for having poor mobile reception.

Unfortunately it is equally notorious for other things.

Now police in Mexico’s north west are conducting a land and sea search for the trio on a 150km long potential crime scene as they confirm three locals had been arrested and a bloody tent had been found.

Police said their burnt out car had been found on a ranch south of Ensenada, the city where they had been last seen.

Their burnt out car had been found on a ranch south of Ensenada. Picture: Supplied

A breakthrough in the case came after a 23-year-old local woman, from the nearby town of Maneadero, was found with the mobile phone of one of the brothers.

She was tracked via GPS after she turned the phone on, about an hour’s drive away from where the trio were camping.

The phone was identified as belonging to one of the Aussies as it had photos of them on it including from their holiday.

Two Mexican brothers, including the woman’s partner, have been arrested and are being questioned in custody. All three were found in possession of drugs, reported to be crystal meth.

Their names are being reported widely in the Mexican press.

Local media has also been reporting three abandoned tents had since been found with blood and “dental parts” discovered in one of them although this could not be verified. A burnt out pick up, believed to belong to one of the men, was confirmed as having been found.

Callum and his brother Jake. Picture: Instagram

Jake, 30, and his 33-year brother Callum shared regular social media posts about the trip for the first two days before they went quiet prompting their mother Debra Robinson to issue an urgent plea for help.

Baja California Attorney-General María Elena Andrade Ramírez said the three arrested were tied to the case but declined to say how, as the investigation was continuing.

“A working team (of investigators) is at the site where they were last seen, where tents and other evidence was found that could be linked to these three people we have under investigation,” Ms Rami­rez said.

“There is a lot of important information that we can’t make public.”

While drug cartels are notoriously active in the area she said “all lines of investigation are open at this time. We cannot rule anything out until we find them”.

Australian and US officials were liaising with families and Mexican authorities but Ms Ramirez said time was working against the case.

“Unfortunately, it wasn’t until the last few days that they were reported missing so that meant that important hours or time was lost,” she said.

Callum Robinson (Left ) and his brother Jake (right).

Mrs Robinson was first to raise the alarm posting a photo of her sons and revealing one of them had a medical condition.

“Reaching out to anyone who has seen my two sons,’ Ms Robinson wrote on Facebook. ‘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, a type 1 diabetic, was a lacrosse star in the US and a member of the Australian men’s national lacrosse team.

His brother was visiting from Australia and is a doctor.

She later posted it was a deeply distressing time for the family but they had hope the trio would be found alive.

“We sincerely appreciate everyone’s concern and thoughts at this time,” the statement read. “We continue to have hope that our two beautiful boys are found.”

Jorge Argoud, operational deputy director of security in Ensenada, said an extensive search of land and sea, including the use of drones, was continuing despite the three suspects in custody.

The search area had been extended from La Bocana de Santo Tomás where the tents were, an area near the lighthouse at Punta San José and an area 150 km south of Ensenada.

Callum and Jake Robinson are believed to have gone missing in the Baja California region near Ensenada. Picture: Facebook

The men were last seen at a well-known surfing spot known as K38 south of Rosarito beach.

The car was found by a ranch manager near the Santo Tomas area who contacted police.

Prime Minister Anthony Albanese said the Department of Foreign Affairs and Trade (DFAT) officials had been in contact with the family following the disappearance.

“This is a really concerning situation,” he said.

“Our embassy in Mexico is working with local authorities as well to try to ascertain what has happened here. We certainly hope that these brothers are found safely but there is real concern about the fact that they’ve gone missing. Their mother is obviously very distressed about this and we just hope for a positive outcome.”

The case has been getting wide coverage in the Mexican press which has been pointing out there are more than 30,000 homicides and 100,000 people missing a year, where 95 per cent of the crimes are never solved.

In 2015, two Australian surfers Adam Coleman and Dean Lucas were found dead in their burnt out camper van in the western Sinaloa state. The two 33-year-olds were travelling to the city of Guadalajara when they disappeared. Three people were convicted over their murder who said they killed them because they resisted a robbery.

WA Premier Roger Cook described the situation as distressing.

“This must be very worrying for the families involved,” he said.

“When we do send our young men and women overseas to enjoy that adventure holiday, they invite an element of risk. I understand one of the individuals has a medical condition that would need ongoing care. I share (the) concerns of all Western Australians in terms of their welfare.”