HONOLULU, Hawaii - Two Oklahoma brothers were among five people killed in a small plane crash in Hawaii Monday.

KGMB, the CBS affiliate in Honolulu reports the two, Marshall and Phillip Cabe, graduated from Cameron University in Lawton.

Fire officials say the plane was carrying the pilot, two skydive instructors and two tandem jumpers when it went down on the island of Kauai.  The station says the group is believed to have been part of a tour operated by Sky Dive Kauai.

Federal investigators are working to determine the cause of the crash.

On Facebook, friends remembered Marshall and Phillip as warm and outgoing. KGMB says a friend of the brothers who set up a GoFundMe account said the two were "great people who will be genuinely missed."