Eight U.S. Marines remained in a hospital in the Australian north coast city of Darwin on Monday after they were injured in a fiery crash of a tiltrotor aircraft that killed three of their colleagues on an island.

All 20 survivors were flown from Melville Island 80 kilometers (50 miles) south to Darwin within hours of the Marine V-22 Osprey crashing at 9:30 a.m. Sunday during a multinational training exercise, Northern Territory Chief Minister Natasha Fyles said.

All were taken to the Royal Darwin Hospital, and 12 had been discharged by Monday, she said