Officials have charged a park concessionaire security guard with filing a false report over an alleged June 7 assault near Jackson Lake Lodge.

Christopher Dascoli, of Lee, Mass., claimed he was hit by a large blunt object while responding to a report of a loud late-night party at employee housing near the lodge in Grand Teton National Park. Dascoli was seriously injured when park rangers arrived on scene, and was given emergency medical care and subsequently transported to St. John’s Medical Center.

In following days, Crimestoppers offered an award of up to $1,000 for information related to the case. The award has been pulled.

On Friday, after an eight-day investigation, park rangers found Dascoli’s claims to be unfounded, park spokeswoman Jackie Skaggs said.

“Chris Dascoli has been issued a mandatory appearance before the federal magistrate,” Skaggs said. “He is being charged with interfering with an agency operation by providing false information to law enforcement and making a false report.”

The magistrate will determine whether Dascoli will be charged with a felony or misdemeanor and assess a fine based on the charge, Skaggs said.

Several persons at the party were interviewed by investigators, but no witnesses came forward with information about the alleged assault itself.

Dascoli was employed by Grand Teton Lodge Company, an authorized concessionaire of the park owned by Vail Resorts. The investigation did not determine what caused Dascoli’s injuries.

“He did receive serious head injuries, but I don’t know how that happened,” Skaggs said. “I guess that will come out in the courts.”