MEXICO CITY (AP) — Mexican authorities said Thursday they have found tents and questioned three people in the case of two Australians and an American who went missing over the weekend in the Pacific coast state of Baja California.

María Elena Andrade Ramírez, the state’s chief prosecutor, would not say whether the three people questioned were considered possible suspects or witnesses in the case. She said only that some were tied directly to the case, and others indirectly.

But Andrade Ramírez said evidence found along with the abandoned tents was somehow linked to the three. The three foreigners were believed to have been surfing and camping along the Baja coast near the coastal city of Ensenada, but did not show up at their planned accommodations over the weekend.

“A working team (of investigators) is at the site where they were last seen, where tents and other evidence was found that could be linked to these three people we have under investigation,” Andrade Ramírez said. “There is a lot of important information that we can’t make public.”