Witnesses come forward to police with details of interactions with Gabby Petito, Brian Laundrie

A couple from Louisiana who were vacationing in Jackson, Wyoming, last month said Wednesday they saw an incident involving Gabby Petito and Brian Laundrie in a restaurant in one of the last sightings of Petito before her death.

Nina Angelo told CNN on Wednesday that she and her boyfriend, Matt England, saw a "commotion" as Petito and Laundrie were leaving The Merry Piglets Tex-Mex restaurant on August 27.

Angelo said Petito was in tears and Laundrie was visibly angry, going into and out of the restaurant several times, continuing to show anger toward the staff around the hostess stand.

The couples' waitress was also visibly shaken by the incident, according to Angelo, who told CNN she did not see any violence or physical altercation between Petito and Laundrie.

A manager at The Merry Piglets told CNN that she did see "an incident" at the restaurant and called the FBI on Wednesday. The manager declined to give CNN her name or describe what happened and said the restaurant did not have surveillance video of the incident.