The Osceola County Sheriff's Office announced this week that Oriol Jean, 18, Anderson Petit-Frère, 18, Peter Mianovich Berlus, 19, Nicholson Fontilus, 20, Steevenson Jacquet, 24, and Antione Joseph Mithon, 32 all disappeared on June 6.

According to cops, the six -- members of Haiti's Special Olympics delegation who were competing in the soccer competition -- were last seen at around 2:30 PM in Kissimmee. All of them, police say, turned in their hotel room keys, left their personal belongings and then vanished.

The sheriff's office said it's now investigating it all as a "missing person's case."

"We are in communication with Walt Disney World, Special Olympics, and our Law Enforcement and Federal partners," cops said in a statement. "At this time, we believe this is an isolated event and do not suspect foul play."

The Special Olympics event began on June 5 in the Orlando area and is slated to run through the end of this week. According to organizers, it's set to feature around 5,500 athletes and coaches -- with roughly 120,000 people expected to tune in at the venues.

One of the missing Haitian Olympians, Petit-Frère, wrote in a social media post just last week that he was excited for the event ... and called it an "honor" to be a part of the team.