Mexican authorities are searching for two Americans who went missing after a kayaking trip off the coast of Puerto Peñasco in the Gulf of California, local authorities said late Saturday.

It’s unknown exactly when the couple went missing.

Yeon-Su Kim is a forestry professor at Northern Arizona University, according to her university bio.

Kim’s husband is Corey Allen, according to a verified GoFundMe page established to raise funds to aid the search for the missing couple.

“The search will be reinforced with reconnaissance flights from the Navy and by land from the Secretary of Public Security and municipal authorities of Puerto Peñasco,” the state coordinator for the civil protection agency of the Mexican state Sonora said on Twitter.

Puerto Peñasco, also known as Rocky Point, is a fishing and resort city on the Gulf of California, south of Arizona.

A Northern Arizona University spokesperson issued a statement after the couple’s disappearance.

“The NAU and Flagstaff communities are hoping and praying that Yeon-Su and her husband Corey are found soon and brought home safely,” the statement said.

“Yeon-Su is a respected member of our NAU faculty and is well known for the warmth she shares with everyone she works with and her passion for our forestry mission,” the statement continued.

“We are so thankful to everyone helping with the search as well as those providing resources to support these efforts.” (CNN)