At least four people were injured Sunday afternoon when a Blue Hawaiian tour helicopter made a hard landing on Kalalau Beach on Kauai.

The incident occurred around 3 p.m.

According to a Kauai Fire Department release, four passengers sustained back injuries and another may have suffered minor undefined injuries in the landing.

The five were taken via helicopter to Princeville Airport, where they were transferred to the care of paramedics and taken to Wilcox Memorial Hospital.

Another Blue Hawaiian helicopter took the pilot and another passenger, both uninjured, to Lihue Airport.

The cause of the hard landing has not yet been determined.