A family is appealing for help to find two Australian brothers who they say have gone missing during a surfing and camping trip in Mexico.

One of the brothers, Callum Robinson, 33, was due back at work in San Diego last week but didn’t show up, according to a friend.

Callum and Jake Robinson, 30, from Perth, were understood to be on a weekend camping trip at the popular surfing spot, Punta San Jose, near Ensenada.

They were travelling with a third person, American Jack Carter Rhoad, who is also considered missing.

Callum lives in the US and Jake recently flew over to visit him. The brothers had posted regularly about their adventures until their social media suddenly stopped on the weekend.

They were last seen on Sunday, April 28, near K-38, an exposed reef surf spot in Baja Norte, according to missing persons posters online.

The men, who were driving a Chevrolet Colorado, did not check in at their Airbnb after the trip and have not contacted family since their social media went quiet.

Their mother Debra has appealed for help and information online.

“Reaching out to anyone who has seen my two sons,” she wrote on a Talk Baja Facebook group.

“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 a type one diabetic so there is also a medical concern.

“Please contact me if you have seen them or know their whereabouts.”

The brothers failed to return from a surfing and camping weekend. Photo: Facebook

A friend of the brothers, who asked to be identified only as Dan, told ABC Radio Perth they had posted fairly regularly about their trip until the weekend.

“They haven’t actually checked into where they were meant to be on Saturday, and no one’s been able to get in contact with them since,” he said.

“We believe Callum was due back at work last week and hasn’t shown up … so obviously friends and family are quite concerned.

“I think everyone’s just sort of hoping that we can spread the word for anyone that has any contacts in America or around that area that might be able to put the word out.

“I believe that Jake and Callum’s parents are trying to get a flight over there now.”

Western Australian Premier Roger Cook said the situation was 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.”

Some social media users say the area in which the brothers were last seen, near K-38, had no phone coverage.

“Lots of surfing spots that have no cell reception. I have seen many lost person reports end in the individual being found and were just staying out of cell coverage longer because the surf was too good,” posted Kevin Ridley.

Carol Hale posted that someone claimed to have spoken to the brothers on Saturday in San Miguel.

“They were asking for directions to another spot in that region,” she wrote.

“It’s very possible to go for days without any cellphone coverage and/or to find a spot with free wifi when traveling Baja Peninsula.

“Fingers crossed, they are simply out enjoying the beautiful beaches, oblivious that anyone is worried about them.”

A Department of Foreign Affairs and Trade spokesperson confirmed the agency was helping the family.

“Owing to our privacy obligations we are unable to provide further comment,” the spokesperson said.

In 2015, WA surfers and life-long friends Adam Coleman and Dean Lucas were murdered, believed to have been shot by gang members in Mexico’s volatile Sinaloa region, before their van and bodies were burnt.