Police say they're frustrated with boyfriend of Gabby Petito for not sharing information on her whereabouts

Investigators searching for answers on the whereabouts of Gabby Petito are expressing frustration that her boyfriend has not shed any light on her possible whereabouts.

Investigators searching for Gabby Petito, the 22-year-old woman who went missing during a cross-country trip, are expressing frustration that Petito's boyfriend has not shed any light on her possible whereabouts.

In June, Petito and her live-in boyfriend, Brian Laundrie, left on a trip from the Florida home they shared with Laundrie's parents in Petito's 2012 white Ford Transit, North Port Police Chief Todd Garrison told reporters in a news conference Thursday afternoon. They intended to drive west, visiting state and national parks along the way, Garrison said.

"Two people went on a trip. One person returned," he said. "And that person that returned isn't providing us any information."

Petito's family said she maintained regular contact with them throughout the journey, and she and Laundrie documented their travels on Instagram and YouTube. Posts show them at the Mystic Hot Springs in Utah on July 26 and on a large rock structure at Arches National Park in Grand County, Utah, on Aug. 12, the same day police in Moab, Utah, responded to an incident involving an altercation by the couple that was called in by a witness. That interaction was captured on police body camera, Garrison said, not elaborating on what was seen in the footage.