Unearthed social media posts give insight into the final hours before Perth brothers Callum, 33, and Jake Robinson, 30, went missing in Mexico.

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

The pair, alongside US citizen Jack Rhoad, 30, went missing near the Rosarito and Ensenada region of Baja California on Saturday morning.

The Perth men’s mother Debra Robinson said she had not heard from her sons since Saturday in a public appeal for help on Thursday.

Authorities are especially concerned for Callum given he is a type one diabetic.

Mexican authorities found a burnt-out white ute, believed to belong to one of the brothers, as well as three abandoned tents south of the Ensenada region.

Local media reported that blood was found in the tents.

Three arrests have been made in Mexico, including a woman carrying one of the brothers’ phones, as well as drugs.

The Department of Foreign Affairs and Trade confirmed they were assisting the Robinson family.

Lacrosse Australia issued a statement on social media expressing its concern over the whereabouts of Jake, Callum and Jack.

It described Callum as an “Australian lacrosse star.”

“We urge the Australian lacrosse community and our global lacrosse family to continue sharing the post from Callum’s friends and family (located on the LA Facebook and Instagram story) in the hope that Callum, Jake and Jack are found safe and sound,” the statement reads.

“Our thoughts are with the families and friends of the Callum, Jake and Jack during this incredibly stressful time.”