MEXICO CITY - Four American hikers stuck on Mexico's Citlaltepetl volcano, located at the border of the states of Puebla and Veracruz, have been rescued, while a fifth is still missing, Puebla's office of civil protection announced on Sunday.

This handout photo released by the Health Ministry of the state of Puebla and the Advanced Medical Emergencies System (SUMA) shows paramedics moving on a stretcher one of four US citizens rescued when they were injured while climbing the inactive Citlaltepetl volcano in Puebla state, Mexico on November 26, 2017. [Photo/VCG]

Two of the five mountaineers were found on Saturday night, before being taken for treatment at a Mexico City hospital. On Sunday, rescue workers found two more of the group, who are currently being treated at a medical center in Puebla.

"A fifth man is missing, who can only be rescued by land, and Mexico's mountain rescue service is handling it," said the civil protection office on Twitter.

On Saturday, the five climbers were reported as stuck towards the summit of Citlalteptel, with several sources reporting they were in the area known as El Sarcofago (The Sarcophagus), 5,200m above sea level.

The Citlaltepetl is Mexico's highest volcano and mountain and is more commonly known as Pico de Orizaba.