Three bodies are reported to have been found near a spot where three tourists went missing while on a surfing vacation in one of Mexico’s most violent states.

Australian brothers Jake and Callum Robinson and an American friend named unofficially as Jack Carter Rhoad failed to show up for an Airbnb booked in the Pacific resort of Rosarito, in the northwestern state of Baja California last Saturday.

On Friday, Reuters reported that two sources close to the investigation had revealed the grim discovery, although the authorities have yet to confirm that publicly. Police had previously discovered what they believe are the trio’s tents, car and a cellphone on a nearby beach.

They are also questioning three unidentified Mexican citizens, although it is unclear whether they are suspects or witnesses.

“There’s a lot of information we can’t make public. We don’t know what condition they’re in,” said María Elena Andrade Ramírez, the chief prosecutor of Baja California.