Four people have died following a light plane crash in waters off the Australian city of Brisbane, police said Sunday.

The Queensland Police Service said the four were killed when the small aircraft crashed off the coast near Redcliffe, a bay-side suburb in the city's north, just after 9:00 a.m. local time.

"A multi-agency operation is underway with Queensland Water Police officers and divers along with the Forensic Crash Unit assisting other agencies, including the Australian Transport Safety Bureau, as investigations continue," police officials said in a statement.