(NORTH PORT, Fla.) -- A massive search is continuing in Florida for Brian Laundrie, the boyfriend of Gabby Petito, the 22-year-old woman who went missing on a cross-country trip and who authorities confirmed as the body discovered in the Bridger-Teton National Forest in Wyoming.
The search for the 23-year-old Laundrie is centered around North Port, Florida, where investigators said Laundrie returned to his home on Sept. 1 without Petito but driving her 2012 Ford Transit.
Laundrie has been named by police as a "person of interest" in Petito's disappearance. Laundrie has refused to speak to the police and has not been seen since Tuesday, Sept. 14, according to law enforcement officials.
The search for Laundrie is the latest twist in the case that has grabbed national attention as he and Petito had been traveling across the country since June, documenting the trip on social media.
Petito's parents, who live in Long Island, New York, reported her missing on Sept. 11 after not hearing from her for two weeks.
Here are the latest developments. All times Eastern:
Sep 29, 5:34 pm
Laundrie left behind new cellphone before going on hike, family attorney says
Brian Laundrie left a new cellphone at home before he went for a hike in the Carlton Reserve on Sept. 14, Laundrie family attorney Steven Bertolino confirmed to ABC News.
The phone was purchased on Sept. 4, Bertolino said, three days after Laundrie returned to his home in North Port from a cross-country trip. Laundrie opened an account with AT&T and the phone wasn't a burner, Bertolino said.
The FBI now has the phone, according to Bertolino. The FBI had no comment to ABC News.
-ABC News' Kristin Thorne and Whitney Lloyd
Sep 29, 11:00 am
Brian Laundrie and parents went camping after he returned home without Gabby Petito
The nationwide search for Brian Laundrie has turned to a Florida campground, where the wanted fugitive's family attorney confirmed to ABC News he went camping with his parents about a week after returning home from a cross-country trip without his girlfriend, Gabby Petito.
Steven Bertolino, the attorney for the Laundrie family, said Brian Laundrie, his father, Christopher, and mother, Roberta, all went camping in early September at the Fort De Soto Park in Pinellas County.
Bertolino confirmed the family went on the camping trip after ABC affiliate station WFTS in Tampa obtained the Fort De Soto Park reservation log under the Freedom of Information Act, which showed Roberta Laundrie checked in on Sept. 6 and checked out on Sept. 8.
A Pinellas County Sheriff's Office helicopter was spotted circling Fort De Soto Park Monday night between 11:40 p.m. until 12:40 a.m., WFTS reported. The sheriff's office only said the helicopter search of the park was part of an active investigation.
Bertolino said Laundrie returned to his family's home in North Port, Florida, following the camping excursion. The parents, through their attorney, denied doing anything to help their son elude the FBI.
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