Updated

A man who tells authorities he was stuck in the mud at the Rio Grande river in New Mexico for three days has been rescued after a group of high school students on a field trip heard him yelling for help.

An Albuquerque Fire Department spokesman tells KRQE-TV that the students and their biology teacher heard the man yelling from a marshy wetlands area Saturday morning.

It took swift-water and technical rescue teams about two hours to pull the unidentified man to safety. His name and condition were not released.

The man told the students he'd spent three days stuck in the mud of the old river bend about two miles north of Interstate 40 in Albuquerque.

It wasn't immediately clear how he became stuck, and calls seeking additional information from the fire department weren't immediately returned.