Concerns grow for Australian brothers missing in Mexico

Mexican investigators have warned crucial hours were lost in the search for two missing Australian brothers, with foul play not ruled out as a potential factor.

Perth siblings Callum and Jake Robinson, both in their 30s, were traveling in the country’s Baja Peninsula on a surfing holiday when they failed to check into pre-arranged accommodation near the city of Ensenada.

Their mother Debra Robinson appealed for help to find her two sons and an American friend they were traveling with, saying she had not heard from them since Saturday.

The Perth brothers were driving this ute when they disappeared. (Supplied/AAP PHOTOS)

“Callum is a type one diabetic so there is also a medical concern,” she wrote on Mexican social media.

Baja California state chief prosecutor María Elena Andrade Ramírez said police had questioned three people in relation to their disappearance but the chances of finding the men had diminished as a result of delays to the investigation.

“Unfortunately, a notice of their disappearance was only filed in the last few days, so very important hours were lost there,” she told a press conference in Mexico.

Investigators have found a burnt-out white ute and abandoned tents believed to have belonged to the missing men.

Officials from the Department of Foreign Affairs and Trade have been providing the family with support.

The department has urged people to exercise a high degree of caution when traveling to Baja California “due to the threat of violent crime.”

Drug cartels are known to operate in the region and the state’s chief prosecutor said “all lines of investigation” remained open.

In 2015, Western Australian surfers Adam Coleman and Dean Lucas were murdered, believed to have been shot by gang members in the neighboring Sinaloa region, before their van and bodies were burned.

Australian Prime Minister Anthony Albanese, as well as opposition foreign spokesperson Simon Birmingham and WA Premier Roger Cook, expressed their concerns for the surfers’ safety and wishes for their safe return.