On Wednesday, the missing Australians’ mother, Debra Robinson, posted on a local community Facebook page an appeal for help in finding her sons. Robinson said Callum and Jake had not been heard from since April 27. They had booked accommodations in the nearby city of Rosarito.

Robinson said one of her sons, Callum, was diabetic. She also mentioned that the American who was with them was named Jack Carter Rhoad, but the U.S. Embassy in Mexico City did not immediately confirm that. The U.S. State Department said it was aware of reports a U.S. citizen missing in Baja, but gave no further details.