Family and friends have identified some of the passengers killed in Monday’s skydiving tour plane crash in Hanapepe, as federal officials continue to investigate the cause.

All five people, including the pilot, on board the single-engine Cessna 182H died when the plane crashed and burned shortly after takeoff from Kauai’s Port Allen Airport at about 9:30 a.m. The plane was on a skydiving tour for SkyDive Kauai.

Kauai County officials said they anticipate officially releasing the names of all victims by the end of Wednesday, but four of the five have been identified by family and friends.

The two tandem jumpers have been identified as brothers Marshall and Phillip A. Cabe of Lawton, Okla. One instructor has been identified as Wayne Rose, while Hawaii News Now identified the other instructor as Enzo Amitrano.

An investigator for the National Transportation Safety Board was to arrive on Kauai this afternoon.

Both Cabe brothers graduated from Cameron University in Oklahoma and were members of the Gamma Rho Chapter Brothers.

Steve Latour, chief executive officer of Sigma Tau Gamma, extended the fraternity’s condolences to their family members. “The entire national organization is thinking about their family and loved ones at this time,” said Latour.

Rose’s twin sister, Autumn Rose, described her brother in a Facebook post as her best friend. “My twin brother was my hero. He was kind, genuine, smart, funny, fearless, and full of life and love,” she said.

“He was always my rock in may times of need, always there to support me in a way only a brother, and I suspect only a twin brother, can. But then again, I think he did that for everyone he cared about,” she added.

Rose’s sister is en route to Kauai from Maryland.