Investigators are currently looking into the mysterious disappearance of six men from Haiti who were scheduled to attend the Special Olympic USA Games in Orlando, Florida, according to the Osceola County Sheriff’s Office.

The missing men are Antione Joseph Mithon, 32; Nicholson Fontilus, 20; Peter Mianovich Berlus, 19; Anderson Petit-Frere, 18; Steevenson Jacquet, 24; and Oriol Jean, 18.

The group consists of “one Special Olympics athlete, one coach, and four Unified partners, all of whom are adults,” according to a representative for the Special Olympics.

“Unified partners” are people without intellectual disabilities who play on the same teams as Special Olympics athletes, they explained.

They were last seen in Kissimmee, Florida, around 2:30 p.m. Monday when they turned in the keys to their hotel rooms, the sheriff’s office said. The men left their personal belongings behind.

Authorities said they believe the disappearance is an isolated incident, and no foul play is suspected.

The Special Olympics, which are being held at several central Florida venues including ESPN’s Wide World of Sports Complex in Walt Disney World, began on Monday, and are scheduled to run throughout the week, according to its website.

Authorities at the sheriff’s office said they are working with Walt Disney World, the Special Olympics and other local law enforcement agencies.

Anyone with information is asked to contact local law enforcement.